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Incoming changeover and feeder protection sit above the branch MCBs. Use ATS for dual source and MCCB / high-frame MCB for the riser.
A small mains/generator board uses Q3R-63 or Q5-100 4P ATS.
Larger feeders use Q5-630 4P ATS.
Downstream, WTCM1-250 MCCB or DZ47-125 (63-125A) protects the riser.
WTXU-03 watches the three-phase incoming.
WTSP-A40 sits on the AC bus.
Q5-630 is a 4P dual-power ATS for AC 100-220V class control.
Q5-100 is the 100A-class 4P ATS.
WTCM1-250 is the moulded-case feeder breaker in this catalog.
Incoming ATS and feeder MCCB must clear a fault without dropping every downstream DZ47 way.
Q3R-63 4P for compact essential boards. Q5-100 4P when the incoming is 100A class. Q5-630 4P for larger dual-source feeders, AC 100-220V control range.
WTCM1-250 MCCB on the outgoing feeder. For 63-125A compact incoming use DZ47-125 (63/80/100/125A). Branch ways stay on DZ47-63 4.5kA.
WTXU-03 (true RMS, 45-65Hz) blocks close-in on phase loss. WTSP-A40 clamps AC surges on the same incoming bus.
ATS, MCCB, high-frame MCB, voltage relay and AC SPD.
High Current Rating: Rated current from 100A to 250A on the WTM1-250, with the WTM1 series spanning 16A to 1250A for DC distribution. DC Voltage Coverage: DC operating voltage of 550V in 2P, 750V in 3P and up to 1500V View WTCM1-250 Moulded Case Circuit Breaker →
Q5-100 4P Dual Power ATS. 100A rated. View Q5-100 4P Dual Power Automatic Transfer Switch ATS →
Q5-630 4P Dual Power Automatic Transfer Switch. 630A rated. View Q5-630 4P Dual Power Automatic Transfer Switch →
DZ47-125 2P 100A MCB. High breaking capacity, thermoplastic shell, 2-pole design. View DZ47-125 2P 100A High Miniature Circuit Breaker MCB →
WTXU-03 3 Phase Voltage Relay. View 3 Phase Voltage Relay WTXU-03 →
WTSP-A40 AC Surge Protective Device SPD. Protection for electrical systems. View WTSP-A40 AC Surge Protective Device SPD →
Size ATS and MCCB from the incoming current on the single-line diagram.
Q3R-63 4P ATS + DZ47-63 ways + WTSP-A40.
Q5-100 4P ATS. Feeder DZ47-125 or WTCM1-250 depending on breaking-capacity need.
Q5-630 4P ATS into WTCM1-250 MCCB outgoing.
WTXU-03 in the ATS / contactor coil circuit so a lost phase cannot reclose.
