ACM33221 12V 4-Pin Automobile Relay – Direct Replacement

Keep your vehicle's electrical system running smoothly with this high-quality ACM33221 Automobile Relay. Designed as a direct alternative to OEM part numbers CM1A-R-12V-H78, UM4667730, and M19, this 12V 4-pin relay is a reliable drop-in replacement for a wide range of automotive applications. Whether you're performing a DIY repair or restoring electrical functionality, this relay delivers consistent switching performance.

Made in Mainland China.

Key Features

Direct OEM Alternative: Compatible with ACM33221, CM1A-R-12V-H78, UM4667730, and M19 relay specifications
12V Operation: Designed for standard 12-volt automotive electrical systems
4-Pin Configuration: Simple plug-and-play installation with standard 4-pin connector layout
Durable Construction: Built with high-grade plastic housing and metal contacts for long-lasting performance
Broad Compatibility: Suitable for a wide variety of vehicles requiring this relay specification
New Condition: Brand new, not pre-charged or used

Specifications

Part Number	ACM33221
Alternative Part Numbers	CM1A-R-12V-H78, UM4667730, M19
Voltage	12V DC
Pin Configuration	4-Pin
Materials	Plastic, Metal
Package Contents	1 x Automobile Relay
Country of Origin	Mainland China

Important Note

Colors shown in product images may vary slightly from the actual item due to monitor brightness and lighting conditions. Please refer to the actual product received. Always verify compatibility with your vehicle's specifications before installation.

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For guidance on automotive electrical safety and relay installation best practices, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Relay

Frequently Asked Questions

Q: What vehicles is the ACM33221 12V 4-pin relay compatible with?

A: The ACM33221 relay is designed to replace OEM part numbers CM1A-R-12V-H78, UM4667730, and M19. It is compatible with any vehicle that uses these relay specifications. We recommend cross-referencing your vehicle's existing relay part number before purchasing to ensure a proper fit.

Q: Is this relay easy to install as a DIY replacement?

A: Yes! The ACM33221 features a standard 4-pin connector layout, making it straightforward to swap out as a like-for-like replacement. Simply locate the existing relay in your vehicle's fuse/relay box, remove the old relay, and plug in the new one. No special tools are required.