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Song Chuan  |  SKU: 303-1AH-C-R1-U01

303-1AH-C-R1-U01 | Genuine Song Chuan® Pins Automotive Relay

$1500
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Description:
A "pins automotive relay" 303-1AH-C-R1-U01 refers to the metal terminals (pins) at the bottom of the relay that connect it to a vehicle's electrical system. Pins Automotive Relay, work condition, used take-off Kenworth T880 2024


Part Number: 303-1AH-C-R1-U01, 3031AHCR1U01
Condition: Used In Good Condition
Manufacture/Brand: Song Chuan

Specifications For 303-1AH-C-R1-U01:

Coil Voltage: 12 VDC
Relay Contact Form: 1 Form A (SPST-NO)
Mounting Style: PCB Mount
Contact Material: Silver Tin Oxide (AgSnO)
Series: 303
Contact Form: SPST (1 Form A)
Power Consumption: 960 mW
Maximum Amperage: 20 A


Fits 303-1AH-C-R1-U01 For 

  • Automotive systems (cars, trucks) where high current circuits (lights, fans, pumps, power systems) need to be switched via a low-current control line

  • Heavy trucks or off‑road vehicles using 24V systems might use the 24V variant

  • Anywhere a compact high-current relay is needed in a modular socket arrangement

  • The “flux tight” / sealed variant may be used in environments subject to contamination, vibration, or exposure (engine compartments, underbody control modules)


Purpose of using 303-1AH-C-R1-U01:

Switch high current loads (up to 70A) using a small control signal
Protect switches and ECU outputs from high current flow
Reduce wiring complexity by placing the relay near the power source/device
Isolate control circuits from power circuits (safer and more reliable)
Extend component life by reducing arcing at control switches


Signs of a Bad Pins Automotive Relay 303-1AH-C-R1-U01:

Symptom Possible Cause
Device not turning on (e.g. fan, light, fuel pump) Relay contacts are burned or stuck open
Clicking sound but no power output Coil is working, but internal contacts are damaged or worn
No clicking sound when activated Coil is dead, or pins 85/86 aren’t getting power/ground
Relay gets hot (even under light load) High internal resistance from worn or pitted contacts
Blown fuse repeatedly Shorted coil or welded internal contacts
Intermittent operation Loose or corroded pins, or failing coil winding
Voltage at pin 30 but nothing at pin 87 when triggered Internal switching failure


About the Manufacturer – Song Chuan:

Song Chuan is a global manufacturer of high-quality electromechanical relays, known for their reliability, performance, and innovation. Founded in 1974 and headquartered in Taiwan, the company produces a wide range of relays for automotive, industrial, and consumer electronics applications. Song Chuan is recognized for combining cost-effective designs with strict quality standards, making it a trusted supplier for OEMs and tier-1 manufacturers worldwide.

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