DESCRIPTION

The AZ4-1CH-12D is a miniature 40-ampere power relay manufactured by American Zettler, designed for high-current switching in industrial control and power distribution systems. It features a dual-pole single-throw (DPST) contact arrangement with 2 Form A or 2 Form C contacts, capable of switching up to 40A at 277VAC (normally open) or 3A at 277VAC (normally closed), with a maximum switched power rating of 560W or 8310VA. The relay operates with a 12VDC coil requiring 9.0VDC minimum to operate and 20.7VDC maximum continuous voltage, drawing 140mA nominal current with 86 ohms coil resistance. Key performance characteristics include a contact resistance of less than 50 milliohms, operate time of 15ms typical, release time of 10ms typical, and dielectric strength of 1500Vrms contact-to-contact and 4000Vrms contact-to-coil. The relay is rated for a minimum of 5×106 mechanical operations and 1×105 electrical cycles at 30A/277VAC resistive load, with an operating temperature range of -40°C to +85°C for DC coils. This relay is ideal for motor control, HVAC systems, power switching, and industrial automation applications requiring reliable high-current switching with compact form factor.