Page 394 - Motor protection and control Manual motor starters, contactors and overload relays

3/320 ABB MOTOR PROTECTION AND CONTROL

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Mechanical latching units

For converting standard contactors into latched contactors.
The WB75-A block contains a mechanical latching device with electromagnetic impulse unlatching
03
1SBC565483F0301 Captive screw type connecting terminals, built-in cable clamps, M3.5 (+,-) pozidriv 2 screw with
(AC or DC) or manual unlatching.
screwdriver guidance; delivered untightened and protected against accidental direct contact.
Operation
WB75-A After closing, the contactor continues to be held in the closed position by the latching mechanism
should the supply voltage fail at the contactor coil terminals.
Contactor opening can be controlled:
• electrically by an impulse (AC or DC) on the WB75-A block coil.
(the coil is not designed to be permanently energized)
• manually by pressing the pushbutton on the front face of the WB75-A block.
Mounting
The WB75-A block is clipped onto the front face of the 1-stack contactor where it takes up two
slots. The two other slots may accept CA5... single pole auxiliary contacts (1 block on each side of
the mechanical latch).
E2676D For contactors Rated control circuit Type Order code Pkg Weight
E1 E2
voltage qty (1 pce)
Terminal marking Uc
V 50 Hz or DC V 60 Hz kg
UA16 ... UA75, 24 24...28 WB75-A FPTN372726R1001 1 0.120
GA75, GAE75 42 42...48 WB75-A FPTN372726R1002 1 0.120
48 48...55 WB75-A FPTN372726R1003 1 0.120
110 110...127 WB75-A FPTN372726R1004 1 0.120
220...230 220...255 WB75-A FPTN372726R1006 1 0.120
230...240 230...277 WB75-A FPTN372726R1005 1 0.120
380...415 380...440 WB75-A FPTN372726R1007 1 0.120
415...440 440...480 WB75-A FPTN372726R1008 1 0.120

1SBC101526S0201 - Rev. B