Finder 55 series general purpose relays are compatible with 58 series relay interface modules, as well as 94 series push-in sockets. Finder 55 series electromechanical relays are available in 2, 3 & 4 poles with PCB or plug-in mounting. Applications include general switchboard installations, industrial automation panels, auxiliary relays, interfacing. The dual-purpose Finder test button can be used in two ways: The plastic pip (located directly above the test button) remains intact. In this case, when the test button is pushed, the contacts operate. When the test button is released the contacts return to their former state. The plastic pip is broken-off (using an appropriate cutting tool). In this case, (in addition to the above function), when the test button is pushed and rotated, the contacts are latched in the operating state, and remain so until the test button is rotated back to its former position. In both cases ensure that the test button actuation is swift and decisive. Finder 55.34.9.024.0090 is comparable to Schneider Magnecraft 782XDX2M4L-24D & 782XDX2C-24D, Omron MY4IN DC24 (S) & MY4 DC24 (S), TURCK Releco C9-40X/024VDC & C9-40/024VDC, IDEC RU4S-M-D24 & RY4S-UDC24V, Relpol Altech R4-2014-23-1024-WTL & R4-2014-23-1024, TE Connectivity Tyco Schrack Potter & Brumfield KHAU-17D12M-24, KHAU-17D12H-24, Allen Bradley 700-HC24Z24-1-4 & 700-HC24Z24.