It is necessary to choose your car model, otherwise you risk buying an item that does not fit. Please note that our search function only provides results relevant to a certain vehicle type.
Alternator A0091543102
An OEM number is a unique code containing letters and digits.
Car manufacturers use them to mark every part inside their cars.
A non-original car part carrying an OEM number demonstrates that the part meets stringent car manufacturer standards and its parameters and technical specifications are identical to original equipment.
All spare parts in the list below are equivalent to OEM number A 009 154 31 02:
- A 009 154 31 02 (original number of MERCEDES-BENZ)
49 items
Alternator RIDEX A 009 154 31 0212V, 90A, B+ (M8), excl. vacuum pump, Ø 55,5 mm
Article number: 4G0960
Reviews - 1
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with multi-belt pulley
- Rated Voltage [V]: 14
- Belt Pulley Ø [mm]: 55,5
- Number of grooves: 6
- Vehicle Main Current: for vehicles with 12V main current
- Rotation Direction: Clockwise rotation
- Alternator Type: excl. vacuum pump
- Fastening Type: Single pivoted lever
- Clamp: B+ (M8)
- Bore Diameter 1 [mm]: 10
- Number of mounting bores: 2
- Number of threaded holes 0
- Distance from belt pulley to alternator [mm]: 82,5
- Item number: 4G0960
- Our price: 143,33 €
- Manufacturer: RIDEX
- EAN number: 4064138066372
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
In stock
-34%
compared to
RRP 220,20 €
143,33 €
Price per item
price incl. 19% VAT
Alternator STARK A 009 154 31 0212V, 90A, B+ (M8), excl. vacuum pump, Ø 55,5 mm
Article number: SKGN-0321182
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with multi-belt pulley
- Rated Voltage [V]: 14
- Belt Pulley Ø [mm]: 55,5
- Number of grooves: 6
- Vehicle Main Current: for vehicles with 12V main current
- Rotation Direction: Clockwise rotation
- Alternator Type: excl. vacuum pump
- Fastening Type: Single pivoted lever
- Clamp: B+ (M8)
- Bore Diameter 1 [mm]: 10
- Number of mounting bores: 2
- Number of threaded holes 0
- Distance from belt pulley to alternator [mm]: 82,5
- Item number: SKGN-0321182
- Our price: 152,25 €
- Manufacturer: STARK
- EAN number: 4064138066365
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
In stock (Item(s) left: 2)
-27%
compared to
RRP 209,10 €
152,25 €
Price per item
price incl. 19% VAT
Alternator AS-PL A 009 154 31 0212V, 90A
Article number: A0361
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with belt pulley
- Quality: STANDARD LINE
- Version: 0123320029
- New part without deposit
- Item number: A0361
- Our price: 152,30 €
- Manufacturer: AS-PL
- EAN number: 5901259485875
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Get a bonus of 1,01 € when you purchase this product
You will receive 1,01 € in your bonus account if you buy this product:
- Accumulate your bonuses through purchasing items marked “BONUS";
- Pay for up to 10% of your order with the accumulated bonuses;
Free delivery on this item
In stock
-34%
compared to
RRP 234,12 €
152,30 €
price incl. 19% VAT
Alternator AS-PL A 009 154 31 0212V, 90A
Article number: A0172
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with belt pulley
- Quality: STANDARD LINE
- Version: 0123335008
- New part without deposit
- Item number: A0172
- Our price: 152,88 €
- Manufacturer: AS-PL
- EAN number: 5901259402186
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Get a bonus of 1,01 € when you purchase this product
You will receive 1,01 € in your bonus account if you buy this product:
- Accumulate your bonuses through purchasing items marked “BONUS";
- Pay for up to 10% of your order with the accumulated bonuses;
Free delivery on this item
In stock
-35%
compared to
RRP 236,58 €
152,88 €
price incl. 19% VAT
Alternator BV PSH A 009 154 31 0212V, 90A, B+ (M8), Ø 50,0 mm
Article number: 555.511.090.010
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 50,0
- Number of grooves: 6
- Clamp: B+ (M8)
- Quality: +Line Original
- Number of mounting bores: 2
- Mounting Angle [degrees]: -60
- Item number: 555.511.090.010
- Our price: 179,60 €
- Manufacturer: BV PSH
- EAN number: 8720264024728
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Get a bonus of 1,30 € when you purchase this product
You will receive 1,30 € in your bonus account if you buy this product:
- Accumulate your bonuses through purchasing items marked “BONUS";
- Pay for up to 10% of your order with the accumulated bonuses;
Free delivery on this item
In stock (Item(s) left: 1)
179,60 €
price incl. 19% VAT
Alternator STARDAX A 009 154 31 0212V, 90A, Ø 56 mm
Article number: STX100301
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with belt pulley
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Number of grooves: 6
- Exchange Part
- Item number: STX100301
- Our price: 187,92 €
- Manufacturer: STARDAX
- EAN number: 7900002894528
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
In stock (Item(s) left: 3)
187,92 €
price incl. 19% VAT
A core charge of 25,99 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Alternator WAI A 009 154 31 0212V, 90A
Article number: 13613N
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with V-ribbed belt pulley
- Number of ribs: 6
- Weight [kg]: 5,9
- Specification: IR / IF
- Length [cm]: 48,77
- Width [cm]: 39,88
- Height [cm]: 43,18
- Item number: 13613N
- Our price: 192,83 €
- Manufacturer: WAI
- EAN number: 0609843054074
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Get a bonus of 1,11 € when you purchase this product
You will receive 1,11 € in your bonus account if you buy this product:
- Accumulate your bonuses through purchasing items marked “BONUS";
- Pay for up to 10% of your order with the accumulated bonuses;
Free delivery on this item
In stock (Item(s) left: 1)
192,83 €
price incl. 19% VAT
Alternator WALKER A 009 154 31 0212V, 90A, M8, 0230, Ø 56 mm
Article number: WAL01369
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Plug Type ID: 0230
- Vehicle Main Current: for vehicles with 12V main current
- Clamp: M8
- Bore Diameter 1 [mm]: 10
- Net weight [kg]: 5,5
- Item number: WAL01369
- Our price: 224,59 €
- Manufacturer: WALKER
- EAN number: 4060426603816
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Alternator AD KÜHNER A 009 154 31 0212V, 90A
Article number: 301563RI
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Number of grooves: 6
- Diameter [mm]: 55
- Item number: 301563RI
- Our price: 226,31 €
- Manufacturer: AD KÜHNER
- EAN number: 805622405836
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Alternator HELLA A 009 154 31 0214V, 90A, Ø 56 mm
Article number: 8EL 012 429-501
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 14
- Pulleys: with freewheel belt pulley
- Belt Pulley Ø [mm]: 56
- Number of grooves: 6
- Used part return not required
- New part without deposit
- Assy. / disassy. by qualified personnel required!
- Item number: 8EL 012 429-501
- Our price: 240,80 €
- Manufacturer: HELLA
- EAN number: 4082300549768
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Get a bonus of 1,02 € when you purchase this product
You will receive 1,02 € in your bonus account if you buy this product:
- Accumulate your bonuses through purchasing items marked “BONUS";
- Pay for up to 10% of your order with the accumulated bonuses;
Free delivery on this item
In stock (Item(s) left: 1)
-47%
compared to
RRP 454,58 €
240,80 €
price incl. 19% VAT
Alternator QUINTON HAZELL A 009 154 31 0212V, 120A, Ø 56 mm
Article number: QRA2822
Submit a review
- Alternator Charging Current [A]: 120
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Fastening Type: Single pivoted lever
- for OE number: 123320029
- Item number: QRA2822
- Our price: 245,57 €
- Manufacturer: QUINTON HAZELL
- EAN number: 5050438398281
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Get a bonus of 1,42 € when you purchase this product
You will receive 1,42 € in your bonus account if you buy this product:
- Accumulate your bonuses through purchasing items marked “BONUS";
- Pay for up to 10% of your order with the accumulated bonuses;
Free delivery on this item
In stock (Item(s) left: 1)
-57%
compared to
RRP 582,03 €
245,57 €
price incl. 19% VAT
Alternator SANDO A 009 154 31 0212V, 90A, CPA0096, Ø 56 mm
Article number: 2010578.0
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Manufacturer Restriction: BOSCH
- Pulleys: with V-ribbed belt pulley
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Plug Type ID: CPA0096
- New Part
- Number of mounting bores: 2
- Item number: 2010578.0
- Our price: 265,73 €
- Manufacturer: SANDO
- EAN number: 224592137202881372028
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Alternator RIVOLV A 009 154 31 0212V, Ø 56 mm
Article number: RIV600175
Submit a review
- Voltage [V]: 12
- Pulleys: with belt pulley, with V-ribbed belt pulley
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Diameter [mm]: 95
- Filter type: Spin-on Filter
- Diameter 3 [mm]: 62
- Thread Size 1: 3 / 4"-16
- Item number: RIV600175
- Our price: 92,05 €
- Manufacturer: RIVOLV
- EAN number: 5901655797473
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Сurrently out of stock
92,05 €
price incl. 19% VAT
excl. delivery costs
A core charge of 8,66 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Sample photo only
Alternator The NewLine A 009 154 31 0212V, 115A, Ø 55 mm
Article number: RE73694N
Submit a review
- Alternator Charging Current [A]: 115
- Voltage [V]: 12
- Manufacturer Restriction: Bosch
- Pulleys: with multi-belt pulley
- Belt Pulley Ø [mm]: 55
- Number of ribs: 6
- New Part
- Used part return not required
- Item number: RE73694N
- Our price: 99,00 €
- Manufacturer: The NewLine
- EAN number: 5415047152561
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Сurrently out of stock
-66%
compared to
RRP 296,31 €
99,00 €
price incl. 19% VAT
excl. delivery costs
Sample photo only
Alternator RIVOLV A 009 154 31 0212V, Ø 56 mm
Article number: RIV600301
Submit a review
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 56
- Number of grooves: 6
- Diameter [mm]: 108
- Filter type: Filter Insert
- Diameter 3 [mm]: 94
- Thread Size 1: M32X1,5
- Item number: RIV600301
- Our price: 109,81 €
- Manufacturer: RIVOLV
- EAN number: 5901655798692
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Сurrently out of stock
109,81 €
price incl. 19% VAT
excl. delivery costs
A core charge of 8,66 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Alternator CEVAM A 009 154 31 0214V, 90A, B+ M8, D+ M5, Ø 56 mm
Article number: 4555
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 14
- Pulleys: with V-ribbed belt pulley
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Vehicle Main Current: for vehicles with 12V main current
- Connector / Clamp: with connection for speed sensor
- Clamp: B+ M8, D+ M5
- Item number: 4555
- Our price: 113,65 €
- Manufacturer: CEVAM
- EAN number: 22107099769885976988
- Condition: Remanufactured
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Sample photo only
Alternator BV PSH A 009 154 31 0212V, 90A, B+ (M8), Ø 50,0 mm
Article number: 555.511.090.340
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 50,0
- Number of grooves: 6
- Clamp: B+ (M8)
- Quality: +Line Selected Reman
- Number of mounting bores: 2
- Item number: 555.511.090.340
- Our price: 114,67 €
- Manufacturer: BV PSH
- EAN number: 8720653858934
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Alternator STARDAX A 009 154 31 0212V, 90A, Ø 56 mm
Article number: STX100175R
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: V-Ribbed Belt Pulley
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Number of grooves: 6
- Exchange Part
- Connector / Clamp: with connection for speed sensor
- Item number: STX100175R
- Our price: 118,53 €
- Manufacturer: STARDAX
- EAN number: 226382168447421684474
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Сurrently out of stock
118,53 €
price incl. 19% VAT
excl. delivery costs
A core charge of 11,07 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Alternator ELSTOCK A 009 154 31 0212V, 90A, M8, 0230, Ø 56 mm
Article number: 28-2796
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Plug Type ID: 0230
- Vehicle Main Current: for vehicles with 12V main current
- Clamp: M8
- Bore Diameter 1 [mm]: 10
- Net weight [kg]: 5,5
- Length 4 [mm]: 56,0
- Item number: 28-2796
- Our price: 118,66 €
- Manufacturer: ELSTOCK
- EAN number: 2222694237030
- Condition: Remanufactured
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Сurrently out of stock
118,66 €
price incl. 19% VAT
excl. delivery costs
A core charge of 53,19 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Alternator LAUBER A 009 154 31 0212V, 90A
Article number: 11.1563
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: V-Ribbed Belt Pulley
- Number of grooves: 6
- Exchange Part
- Connector / Clamp: with connection for speed sensor
- Item number: 11.1563
- Our price: 120,09 €
- Manufacturer: LAUBER
- EAN number: 5901321998852
- Condition: Remanufactured
- Reference number OEM: A0091543102
Show OEM numbers of the product
Contents of the Alternator LAUBER set:
Description of the product
Units
Article number
Belt Pulley, alternator
1
CQ1040448
Rectifier, alternator
1
CQ1080572
Details
Free delivery on this item
Сurrently out of stock
120,09 €
price incl. 19% VAT
A core charge of 13,10 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Alternator STARDAX A 009 154 31 0212V, 90A, Ø 56 mm
Article number: STX100301R
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with belt pulley
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Number of grooves: 6
- Exchange Part
- Item number: STX100301R
- Our price: 126,82 €
- Manufacturer: STARDAX
- EAN number: 7900003754425
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
Сurrently out of stock
126,82 €
price incl. 19% VAT
A core charge of 11,07 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Sample photo only
Alternator BV PSH A 009 154 31 0212V, 90A, B+ (M8), Ø 56,0 mm
Article number: 555.511.090.215
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 56,0
- Number of grooves: 6
- Clamp: B+ (M8)
- Quality: Bosch Reman
- Number of mounting bores: 2
- Item number: 555.511.090.215
- Our price: 129,23 €
- Manufacturer: BV PSH
- EAN number: 872025311361
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Alternator ALANKO A 009 154 31 0212V, 90A, Ø 56 mm
Article number: 10442354
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: V-Ribbed Belt Pulley
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Rotation Direction: Clockwise rotation
- New Part
- Quantity Unit: Piece
- Item number: 10442354
- Our price: 131,17 €
- Manufacturer: ALANKO
- EAN number: 4053082240457
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
Сurrently out of stock
-44%
compared to
RRP 237,78 €
131,17 €
price incl. 19% VAT
Alternator EAI A 009 154 31 0212V, 90A, with integrated regulator
Article number: 56778
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with belt pulley
- Number of ribs: 6
- Supplementary Article / Supplementary Info: with integrated regulator
- Rotation Direction: Clockwise rotation
- Connector / Clamp: with connection for speed sensor
- Diameter [mm]: 55
- Technical Information Number: C04
- Item number: 56778
- Our price: 133,91 €
- Manufacturer: EAI
- EAN number: 3596405677802
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
Сurrently out of stock
133,91 €
price incl. 19% VAT
A core charge of 54,42 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Sample photo only
Alternator JP GROUP A 009 154 31 0212V, 90A, Ø 56 mm
Article number: 1390100700
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Item number: 1390100700
- Our price: 134,05 €
- Manufacturer: JP GROUP
- EAN number: 5710412248253
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
Сurrently out of stock
-64%
compared to
RRP 379,13 €
134,05 €
price incl. 19% VAT
Alternator LUCAS A 009 154 31 0212V, 90A, M8, 0230, Ø 56 mm
Article number: LRB00428
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Plug Type ID: 0230
- Vehicle Main Current: for vehicles with 12V main current
- Clamp: M8
- Bore Diameter 1 [mm]: 10
- Net weight [kg]: 5,5
- Item number: LRB00428
- Our price: 136,93 €
- Manufacturer: LUCAS
- EAN number: 5708279028101
- Condition: Remanufactured
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
Сurrently out of stock
136,93 €
price incl. 19% VAT
A core charge of 29,75 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Alternator STARDAX A 009 154 31 0212V, 90A, Ø 56 mm
Article number: STX100175
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: V-Ribbed Belt Pulley
- Belt Pulley Ø [mm]: 56
- Number of ribs: 6
- Number of grooves: 6
- Exchange Part
- Connector / Clamp: with connection for speed sensor
- Item number: STX100175
- Our price: 137,10 €
- Manufacturer: STARDAX
- EAN number: 7900003280795
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
Сurrently out of stock
137,10 €
price incl. 19% VAT
A core charge of 25,99 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Alternator SNRA A 009 154 31 0212V, 90A, with integrated regulator
Article number: ME8014
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Pulleys: with belt pulley
- Number of ribs: 6
- Supplementary Article / Supplementary Info: with integrated regulator
- Rotation Direction: Clockwise rotation
- Connector / Clamp: with connection for speed sensor
- Diameter [mm]: 55
- Technical Information Number: C04
- Item number: ME8014
- Our price: 138,67 €
- Manufacturer: SNRA
- EAN number: 3660089298377
- Condition: New
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
Сurrently out of stock
138,67 €
price incl. 19% VAT
A core charge of 54,42 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Alternator EUROTEC A 009 154 31 0214V, 90A
Article number: 12039420
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 14
- Item number: 12039420
- Our price: 143,37 €
- Manufacturer: EUROTEC
- EAN number: 4250294717221
- Condition: Remanufactured
- Reference number OEM: A0091543102
Show OEM numbers of the product
Details
Free delivery on this item
Сurrently out of stock
-61%
compared to
RRP 368,00 €
143,37 €
price incl. 19% VAT
Alternator LAUBER A 009 154 31 0212V, 90A
Article number: 11.1090
Submit a review
- Alternator Charging Current [A]: 90
- Voltage [V]: 12
- Number of grooves: 6
- Exchange Part
- Item number: 11.1090
- Our price: 146,94 €
- Manufacturer: LAUBER
- EAN number: 5901321771332
- Condition: Remanufactured
- Reference number OEM: A0091543102
Show OEM numbers of the product
Contents of the Alternator LAUBER set:
Description of the product
Units
Article number
Rectifier, alternator
1
CQ1080572
Details
Free delivery on this item
Сurrently out of stock
146,94 €
price incl. 19% VAT
A core charge of 13,10 € (incl. 19% VAT) is NOT included in the price and will be refunded to the customer when the old part is returned
Load more
- 1
- 2
The best offers: