Siemens GMSG-GCB Instruction Manual

27Figure 21: Undervoltage lock/operate selectionFigure 22: Capacitor-trip devicePosition A: lockedPosition B: unlocked (operating position)Cancel the lock for the undervoltage release by shifting the locking screw (29.0) from A to B.ABAB120 or 240 Vacsupply01T242352oSD5343352oA1A252T(+)(-)(+)(-) 12Construction and mode of operation ofsecondary release and undervoltagereleaseRefer to Figure 19: Construction of secondaryshunt release and Figure 20: Latch details onpage 26 and Figure 21: Undervoltage lock/operate selection.The release consists of a spring power-storingmechanism, a latching device and anelectromagnet. These elements areaccommodated side-by-side in a housing(3.0), with a detachable cover and threethrough-holes (5.0) for fastening screws. Thesupply leads for the trip coil are connected toa terminal block (33.0).The energy-storing mechanism consists of thestriker pin (23.0) and its operating spring(31.0), which is mostly located inside thestriker pin (23.0). When the spring iscompressed, the striker pin is held by a latch(25.0), whose sloping face is forced againstthe appropriately shaped striker pin (23.0) byspring (27.0). The other end of the latch(25.0) is supported by a partly-milled lockingpin (21.0) (refer to Figure 20: Latch details onpage 25) that pivots in the cover sheets of themagnet armature (9.0). The armature (9.0)pivots in front of the poles of the U-shapedmagnet core, (1.0) and is pulled away from itby the tension spring (11.0).If the magnet coil (7.0) of the shunt release3AX1101 is energized by a trip signal, or ifthe tripping pin (15.0) is mechanicallyactuated, magnet armature (9.0) is swungagainst the pole faces.When this happens, the latch (25.0) loses itssupport and releases the striker pin (23.0),that is forced out by the spring (31.0).On the undervoltage release 3AX1103, thelatch (25.0) is held by the locking pin (21.0)as long as the armature (9.0) is attracted(energized) (refer to Figure 17: Operatorsequence operation diagram on page 24). Ifthe circuit of the magnet coil (7.0) isinterrupted, the armature (9.0) drops off,thus causing the latch (25) to lose its supportand release the striker pin (23).23.0 Striker pin29.0 Screw23.029.023.029.0A CapacitorB ResistorC RectifierD Capacitor tripABCD