1SBN040100R1010

ABB 1SBN040100R1010 – WA4-10 is a front-mounted mechanical latching unit designed to convert compatible ABB AF contactors and NF contactor relays into mechanically latched switching devices. Once the contactor has been energized and closed, the WA4 mechanism mechanically holds it in the closed position even if the contactor coil supply voltage subsequently fails or is removed. The WA4-10 version is designed specifically for 24 V DC control and can be operated using a 500 mA PLC output. ABB lists it for AF09…AF38 contactors and compatible 4-pole NF contactor relay configurations.