CMA51H-S-DC12V-C 12V DC Automotive Relay, 20A SPDT, 5-Pin
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Prices updated: 14 Oct 2026
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About this product
A fully sealed 12 V DC automotive SPDT relay rated up to 20 A at 16 VDC, for switching high-current loads in vehicles and 12 V projects. Its 270 Ω coil draws about 44 mA at 12 V and pulls in at 8.4 V. The listed electrical life is at least 10^5 operations.
Specifications
- Contact form
- SPDT (1C)
- Contact rating
- 20 A @ 16 VDC
- Coil voltage
- 12 VDC
- Coil resistance
- 270 Ω ±10%
- Coil power
- 530 mW
- Pull-in voltage
- 8.4 VDC
- Contact resistance
- ≤ 50 mΩ
- Electrical life
- ≥ 10^5 operations
- Mechanical life
- ≥ 5 × 10^6 operations
Frequently asked questions
Can an Arduino pin drive this relay directly?
No. The coil draws about 44 mA at 12 V, which is more than a typical microcontroller pin should supply. Drive the coil through a transistor or MOSFET, with a flyback diode across the coil.
Can I run this relay from a 5 V supply?
Its pull-in voltage is 8.4 V and its coil is rated for 12 V DC, so use a 12 V coil supply. It is not specified for 5 V coil operation.
