WCQ2G Moulded case circuit breaker
WCQ2G is one of updated type MCCBs researched and developed by the company by using advanced design and manufacture technology internationally.
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Popular Wcq2g ATS Isolated Type Double Power Supply Automatic Transfer Switch
WCQ2G series MCB is one of updated type MCCBs researched and developed by the company by using advanced design and manufacture technology internationally.
WCQ2G series double power supplies automatic transfer switch (ATS) applies to AC50Hz, rated operation voltage 400V, rated operation current 16A to 2000A, to two circuits power supply of emergency power supply system. It can be set as manual of the mutual transfer between frequent-use and backup power supply, as circuit controlling switch of control, signal, and interlock functions. Some types of the product have communication ports to make it realisable of remote control and unattended substation to the user. Itapplies to residence community, hospital, mall, airport, etc.,
The ATS meets standards IEC/EN60947 and GB/T14048.11.
Model and meaning
Working environment
The WCQ2G automatic transfer switch works reliably under the following conditions:
Altitude not exceeding 2000 meters
Ambient temperature not higher than 40℃,not lower than-5℃,relative humidity not more than 95%.
No explosion hazardous medium environment
No rain or snow attack environment
Note:If the switch is expected to be used in conditions where the ambient air temperatureis higher than+40℃or lower than -5~-45,the user should explain to the manufacturer.
KEY INFORMATION
WCQ2G
| Pole | 3P, 4P |
| Voltage | AC230V/400V |
| Icm | 8KA-26KA |
| Inm(A) | 100,160,250,630 |
| In(A) | 16-630 |
MAIN TECHNICAL DATA
| Conventional thermal current Ith (A) | 100 | 160 | 250 | 630 | 1600 | |||||||||||
| Rated current In (A) | 20 | 40 | 63 | 80 | 125 | 160 | 200 | 250 | 400 | 630 | 800 | 1000 | 1250 | 1600 | ||
| Rated insulation voltage Ui (V) | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | ||
| Dielectric strength (V) | 5000 | 5000 | 5000 | 5000 | 5000 | 5000 | 5000 | 5000 | 8000 | 8000 | 10000 | 10000 | 10000 | 10000 | ||
| Rated impulse withstand voltage Uimp (kV) mounting catagory (IV) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 12 | 12 | 12 | 12 | 12 | 12 | ||
| Rated service current Ie (A) | 400V | AC-31 | 20 | 40 | 63 | 80 | 125 | 160 | 200 | 250 | 400 | 630 | 800 | 1000 | 1250 | 1600 |
| AC-33 | 20 | 40 | 63 | 80 | 125 | 160 | 200 | 250 | 400 | 630 | 800 | 1000 | 1250 | 1600 | ||
| AC-35 | 20 | 32 | 40 | 63 | 80 | 125 | 160 | 200 | 250 | 400 | 630 | 800 | 1000 | 1250 | ||
| 230V | DC-31 | 20 | 40 | 63 | 80 | 125 | 160 | 200 | 250 | 400 | 630 | 800 | 1000 | 1250 | 1600 | |
| DC-33 | 20 | 40 | 63 | 80 | 125 | 160 | 200 | 250 | 400 | 630 | 800 | 1000 | 1250 | 1600 | ||
| DC-35 | 20 | 32 | 40 | 63 | 80 | 125 | 160 | 200 | 250 | 400 | 630 | 800 | 1000 | 1250 | ||
| Power of motor P (400V) (kW) | 10 | 25 | 25 | 30 | 63 | 80 | 100 | 132 | 220 | 280 | 450 | 560 | 560 | 560 | ||
| Rated short time withstand current Icw (kA Rms) 0.1S/1S | 3/2.0 | 4/4.2 | 5/2.5 | 9/5 | 20/10 | 20/10 | 25/12 | 25/12 | 40/20 | 50/25 | 90/50 | 90/50 | 90/50 | 90/50 | ||
| Rated breaking capacity (kA Rms) AC35 400V | 160 | 320 | 500 | 640 | 1000 | 1000 | 1600 | 1600 | 3200 | 3200 | 8000 | 8000 | 8000 | 8000 | ||
| Rated connecting capacity (kA Rms) AC35 400V | 200 | 400 | 630 | 800 | 1250 | 1250 | 2000 | 2000 | 4000 | 4000 | 10000 | 10000 | 10000 | 10000 | ||
| Rated short circuit breaking capacity Icm (kA peak value) | 8 | 8 | 10 | 10 | 12 | 12 | 17 | 17 | 30 | 30 | 50 | 50 | 50 | 50 | ||
| Mechanical life (circulation operation times) | 100000 | 100000 | 100000 | 100000 | 100000 | 100000 | 100000 | 100000 | 5500 | 5500 | 4000 | 4000 | 4000 | 3000 | ||
| Electrical life | Cos Φ = 0.95 AC31 | 2500 | 2500 | 2500 | 1500 | 1500 | 1500 | 1500 | 1500 | 750 | 750 | 600 | 600 | 600 | 450 | |
| Cos Φ = 0.65 AC33 | 1500 | 1500 | 1500 | 1000 | 1000 | 1000 | 1000 | 1000 | 500 | 500 | 400 | 400 | 400 | 300 | ||
| Cos Φ = 0.35 AC35 | 750 | 750 | 750 | 500 | 500 | 500 | 500 | 500 | 250 | 250 | 200 | 200 | 200 | 150 | ||
| Transfer time | I-O-II or II-O-I (s) | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.1 | 1.1 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | |
| I-O or II-O-I (s) | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.7 | 0.7 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | ||
| Motor energy consumption | 24V (DC) (w) | 40 | 40 | 40 | 75 | 75 | 75 | 75 | 75 | 90 | 90 | 120 | 120 | 120 | 120 | |
| 230V (AC) (w) | 40 | 40 | 40 | 75 | 75 | 75 | 75 | 75 | 90 | 90 | 120 | 120 | 120 | 120 | ||
| Operation torque (Nm) | 12 | 12 | 12 | 19 | 19 | 19 | 26 | 26 | 39 | 39 | 39 | 39 | 39 | 60 | ||
| Weight (kg) | Three poles | 7.2 | 7.2 | 7.2 | 8 | 8 | 10 | 10 | 22 | 22 | 22 | 34 | ||||
| Four poles | 4.2 | 4.3 | 4.4 | 7.5 | 7.5 | 7.5 | 9 | 9 | 11 | 11 | 28 | 28 | 28 | 40 | ||
OVERALL AND MOUNTING DIMENSION(MM)
This topic is covered in more detail in Double Power Supplies Wcq2g Automatic Intelligent Type Changeover Switch 50Hz 400V Transfer Switch.
2 MBFREQUENTLY ASKED QUESTION (FAQ)
What does "isolated type" mean for this ATS?
An isolated-type ATS provides a clear physical separation between the two source paths, so the main and backup circuits cannot feed each other through the switching device. This isolation improves safety during maintenance and prevents back-feeding into either supply.
How do the mechanical and electrical interlocks work?
The mechanical interlock physically prevents both source contacts from closing at the same time, while the electrical interlock inhibits the closing command of one source while the other is closed. Together they ensure only one source can be connected to the load at any moment.
Why is anti-parallel connection important?
Connecting two independent sources in parallel can cause dangerous circulating currents, out-of-phase synchronization problems, and equipment damage. The interlock system guarantees a break-before-make sequence so the sources are never paralleled unintentionally.
What is a double power supply transfer?
Double power supply means the load is fed from two independent sources—normal (utility) and emergency (generator or second feeder)—and the ATS seamlessly transfers between them. The controller decides which source is healthy and routes the load accordingly.
How does isolation help during maintenance?
Because the isolated design provides a visible/positive break and locked-off position, maintenance staff can work on one source while the load is fed from the other, with confidence that the terminals are isolated. The emergency manual handle also allows safe local operation.
What pole options are offered (1P/2P/3P/4P)?
It is available in 1P, 2P, 3P, and 4P to match single-phase or three-phase systems. Use 3P for a three-phase three-wire installation and 4P when you need to switch the neutral alongside the phases.
What is the switching time?
The internal stored-energy/mechanism switching is fast (sub-second), while the overall transfer including detection and generator stabilization depends on the backup set. Adjustable delay settings prevent nuisance transfers during brief dips.
What applications suit this isolated ATS?
It is ideal for hospitals, shopping centers, airports, residential communities, and any site requiring reliable, fail-safe dual-source switching with strong isolation and interlocking.
Which standard governs this isolated transfer switch?
It complies with IEC/EN 60947-6-1 (and GB/T 14048.11), which specifically addresses transfer switching equipment including the interlock and isolation requirements for automatic transfer switches.
How do I test the isolation and interlock?
Periodically attempt to close both sources together (via the controller and manually) to confirm the interlock blocks it, and verify the break-before-make sequence. Also check that the isolation position opens both source paths and that locking/tagging can be applied safely.
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