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Auto Parts / Relays | A75

Relays for starters

For commercial vehicles, buses and assemblies of equipment.
Preferred for engines where starting cannot be heard.

1 2 A C 50e 30

D+
+
50e 50f D+ 31 15 31 50f
B 50e 30 D

D+
3 4 31 51f 50a 85 D+ 15 50

45 50b 30 31 45

Twin starting relays Start-locking/
5 5 Application start-repeating relay
Primary-current switch for parallel operation of Switches off the starter when the engine starts
two sliding-gear starter motors. Following pinion to run on its own.
engagement on both starters, the twin starting – Prevents actuation of the starter when the
relay switches on both primary current windings engine is running.
instantaneously. – Prevents actuation of the starter after the
start command has been interrupted, until the
starter and engine have stopped.
Start-repeating function:
Start-repeating relay Start-locking relay – Automatic repetition of the engagement
– 3
1 + Protects the solenoid switch Protects the starter, the process in the event of problems with starting,

of the starter against overload. pinion and the flywheel ring gear against over- until the starter pinion engages.
Start-repeating function: load. Fitting: vertical on a vibration-free wall,
– Automatic repetition of the mestring Start-locking function: protected against water and dirt.
process in the event of problems with – Switches off the starter when the engine starts
starting, until the starter pinion engages. to run on its own.
Fitting: vertical on a vibration-free wall, – Prevents actuation of the starter when the
protected against water and dirt. engine is running.
– Prevents actuation of the starter after the
start command has been interrupted, until the
starter and engine have stopped.
Fitting: vertical on a vibration-free wall,
protected against water and dirt.

Rated voltage Type of current Switching Connection Fastening Dimensions fig. Part number
Rated current L x w x H
mm mm
Start-repeating relay
24 V 15 A AC mechanical blade terminals 2x hole Ø 5.3 50 x 33.5 x 47 4 D 0 331 800 003

Start-locking relay
24 V 20 A AC C blade terminals 3x hole Ø 5.5 187 x 103 x 44 2 A 0 331 801 001
24 V AC electronical blade terminals 2x hole Ø 6.4 100 x 95 x 35 3 B 0 331 801 300
Start-locking/Start-repeating relay
24 V* AC electronical blade terminals 2x hole Ø 6.4 100 x 95 x 35 3 C 0 331 802 100
* Terminal 50f – max. 15 amps.
Dual starting relay
24 V DC V screws M 8 4x hole Ø 8.4 232 x 180 x 45 5 E 0 333 500 001

2010 | 2011 Bosch Automotive Aftermarket / Auto Parts

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