CM1AR12VH91 ACM33221 Automotive Relay — 12VDC, 4 Pins (1 piece) Key benefits Reliable control of 12V automotive circuits. The CM1AR12VH91 relay provides a dependable way to switch electrical loads in vehicles that use a 12V control circuit. Simple replacement and crossreference ready. Labeled with model CM1AR12VH91 and part number ACM33221 for easy identification when servicing or replacing existing relays. Compact 4pin design for straightforward installation. The 4pin footprint fits common relay sockets and mounting configurations, helping reduce installation time. What this relay does and why you need it Functions as an electromechanical switching device that uses a 12VDC coil to actuate contacts. It isolates control circuits from switched circuits so switches, sensors, or control modules can operate higherpower devices safely. Solves common automotive electrical problems by replacing worn or faulty relays that cause intermittent operation, failure to energize circuits, or unreliable accessory performance. Useful as a direct, plugin replacement when the original vehicle or equipment specifies CM1AR12VH91 or ACM33221. Key attributes Model: CM1AR12VH91 Cross/reference: ACM33221 Coil voltage: 12VDC Pin count: 4 pins Quantity: 1 piece Compatibility: Intended for automotive 12V systems and devices that accept a 4pin relay with the listed model/part number Typical applications (examples) Auxiliary lighting and headlamp circuits where a 12V relay is used to switch lights from a control signal. Cooling fan or blower motor control where a relay isolates the control circuit from the motor supply. Horn, starter, fuel pump, or accessory circuits in vehicles and light equipment that specify CM1AR12VH91 / ACM33221. Installation and usage notes Verify vehicle or equipment compatibility by matching the model number CM1AR12VH91 or part number ACM33221 and the 4pin socket configuration before installation. Sold as a single replacement unit (1 piece). Ensure secure seating in the relay socket and check wiring and fuse protection per vehicle specifications. Professional, dependable replacement relay for 12V automotive systems.