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Distribution boards in offices, malls and hotels mix lighting, HVAC and sockets. Overload, leakage and mains loss have to be isolated without shutting the whole floor.
A typical commercial board starts with incoming changeover, then MCB / RCCB ways for lighting and sockets, plus a modular contactor for timed HVAC or corridor lighting.
WTAIDQ devices are DIN-rail parts that drop into WT-HT surface boxes.
DZ47-63 is a 2P 63A MCB at 230/400V, 4.5kA, IEC 60898-1, C curve.
WTH8-63 switches lighting and HVAC loads at AC 400V, 50/60Hz, IEC/EN 61095.
Q3R-63 4P ATS keeps essential circuits live when the utility fails.
Three failures show up most often in commercial risers. Each one maps to a catalog rating, not a generic claim.
A short on one tenant circuit should not black out the floor. DZ47-63 (2P 63A, 230/400V, 4.5kA, IEC 60898-1) sits on branch ways. For larger incoming feeders use DZ47-125 (63/80/100/125A).
WTH8-63 (63A, AC 400V, DIN rail, IEC/EN 61095) and WTH8-16 (16A, silver-alloy contacts, arc extinction <15ms) take a BMS or timer signal so fans and lights drop out after hours.
Q3R-63 4P ATS transfers essential loads to generator. WTSP-A40 AC SPD clamps transients on the incoming bus before they reach contactors and controls.
MCB, modular contactor, ATS, SPD and enclosure from the live catalog.
Strong protection capability MCB with 4500A breaking capacity, 230/400V rated voltage, 63A rated current, C curve. Compact 2-pole design. View DZ47-63 2P 63A Miniature Circuit Breaker MCB →
DZ47-125 2P 100A MCB. High breaking capacity, thermoplastic shell, 2-pole design. View DZ47-125 2P 100A High Miniature Circuit Breaker MCB →
WTH8-63 Household Modular Contactor 63A. View WTH8-63 Household Modular Contactor 63A →
WT-HT 12WAY Surface Distribution Box. View WT-HT 12WAY Surface Distribution Box →
Q3R-63 4P Dual Power ATS. 63A rated. View Q3R-63 4P Dual Power Automatic Transfer Switch ATS →
WTSP-A40 AC Surge Protective Device SPD. Protection for electrical systems. View WTSP-A40 AC Surge Protective Device SPD →
Use the current and pole count on the drawing, then pick the matching SKU.
DZ47-63 2P/4P ways for lighting and sockets. Incoming DZ47-125 when the riser is 80-125A.
WTH8-16 or WTH8-63 on DIN rail, coil driven by a timer or BMS. WTH8-63 is AC 400V, 50/60Hz.
Q3R-63 4P ATS for generator changeover. WTSP-A40 on the incoming AC bus.
WT-HT 12WAY box: 250 x 193 x 105 mm. 5WAY and 18WAY sizes are in the same family.
