Generic 30/40A Bosch Style Relay


  • These 5-pin 40 amp relays are a staple of the automotive industry. They are useful for a number of wiring configurations included polarity reversing circuits.

    Load pin (87) is rated for 40 amps; alternative load pin (87a) is rated for 30 amps.

    1. 40 Amp Maximum Load
    2. 30 Amp 5th Pin
    3. Useful For Reversing Voltage
    1. One 30/40 Amp Relay
    1. Part Number: RL-40B
    2. Max. Voltage: 13.8 Volts DC
    3. Max. Current: 30 Amps (Pin 87a), 40 Amps (Pin 87)


This product contains chemicals known to the state of California to cause cancer.