2PCS RTT7121 12V 40A Four‑pin Relay — reliable replacement relays for vehicle and equipment electrical systems Key benefits Restores critical functions quickly: replaces worn or failed relays for wipers, air conditioning, reversing sensors, antitheft circuits and other 12V systems. Handles current safely: 40A switching capacity lets the relay control motors, compressors and load accessories without overstressing wiring or smaller relays. Easy swapin replacement: four‑pin design and compact footprint make installation fast and reduce downtime. Practical twopack: two identical RTT7121 relays give one immediate replacement plus a spare for future service. Main features and attributes Model: RTT7121 Quantity: 2 pieces Rated voltage: 12 volts DC Rated current/switching capacity: 40 A Pin count: 4 pins (four‑pin configuration) Functionality: electromagnetic relay for switching 12V circuits; suitable for motor loads, solenoids and automotive accessories Compatibility: designed for 12V vehicle electrical systems and applications listed below; suitable as a direct replacement where RTT7121 12V 40A four‑pin relays are specified Design: compact four‑pin package for common relay sockets and inline mounting Performance and reliability current rating supports sustained switching of wipers, air conditioning compressors and other heavy loads Electromechanical switching provides predictable on/off control and long service life under normal automotive conditions Suitable for and maintenance tasks where a robust 12V 40A relay is required Typical use cases 1) Car air conditioning relay replacement Swap in an RTT7121 relay to restore compressor clutch operation, reestablishing A/C function when the original relay has failed or intermittent symptoms occur. 2) Wiper motor and reversing radar/anti‑theft systems Use the RTT7121 to control wiper motors or as a switching element in reversing radar and anti‑theft circuits that require a reliable 12V relay with a 40A capacity. 3) General vehicle accessory switching Ideal for controlling auxiliary lights, fans, or other 12V accessories that draw significant current and need a dependable four‑pin relay solution. Installation notes Ensure the vehicle or equipment battery is disconnected or circuits are powered down before replacing relays. Verify pin layout and wiring match the original relay socket or wiring harness before installation. Confirm RTT7121 12V 40A four‑pin is the specified replacement for your application to ensure correct operation. What's included Two (2) RTT7121 12V 40A four‑pin relays This 2PCS RTT7121 12V 40A four‑pin relay set offers a straightforward, ‑capacity replacement option for common automotive and equipment electrical needs, helping restore function and reliability with an easytoinstall component.