Allen-Bradley 700-M400A1 Relay

Allen-Bradley 700-M400A1 is a four-pole, four normally open industrial control relay from the 700-M family, designed to switch multiple control circuits in automation and machine control. This AC-coil relay is offered with coil-voltage options including 100 V AC (50/60 Hz) and 110–120 V AC (60 Hz), allowing integration with common plant power supplies. With four normally open contacts, it supports independent paths for interlock logic, sequencing, or energizing auxiliary circuits within panels, conveyors, or process equipment. The 700-M series relays are intended for use with standard 700-M sockets and mounting bases, simplifying replacement and wiring in established control architectures. The M400A1 designation identifies this specific contact-configuration variant within the 700-M lineup, enabling precise matching to a control schematic that requires four active paths without any normally closed contacts. This relay is a component choice for engineers seeking a familiar form factor in legacy Allen-Bradley installations and other environments where the 700-M family is used.