AZ421-80-1L-21MA is a four-pole miniature general-purpose relay designed for high-reliability switching applications. It features an 18 VDC nominal coil voltage with a maximum continuous rating of 29 VDC, a coil resistance of 430 ohms (±10%), and a must-operate voltage of 13.0 VDC. The relay exhibits rugged construction with a life expectancy exceeding 100 million mechanical operations and 500 million minimum mechanical cycles, with contact resistance less than 50 milliohms initially. It operates reliably across a wide ambient temperature range of -55°C to 80°C and includes balanced spring-held armature design for dependable operation in any position. The relay is suitable for industrial control, instrumentation, and switching applications requiring compact size, high reliability, and low power consumption.