DC Miniature Circuit Breaker 125A | 1000V DC MCB 10kA
WTM7-125 125 A frame DC miniature circuit breaker: 10 kA Icu, up to 1000 V DC on four poles, 32 to 125 A, B, C and D curves, non-polarised 50 mm² terminals.
Circuit Breaker
WTAIELE manufactures miniature, residual current, moulded case and smart circuit breakers for AC and DC distribution, from 6 A to a 250 A frame.
MCB, RCCB, MCCB or Smart: Matching the Breaker to the Circuit
The breaker follows the circuit, and the circuit type decides the family. Final circuits for lighting and sockets take a miniature breaker: DZ47-63 up to 63 A, DZ47-125 up to 100 A. Where the circuit needs earth leakage protection as well as overload protection, DZ47LE adds residual current sensing at 30, 100 or 300 mA.
Feeders and mains take a moulded case breaker, because a miniature frame no longer has the current capacity or the breaking capacity. WTCM1-250 covers AC feeders, and WTM1-250 covers DC feeders up to 1500 V. DC final circuits use WTM7-63, which is rated by pole count.
Smart breakers answer a different question: they replace a standard two-pole breaker where the site needs metering and remote switching, not where the fault level is higher. WTB2-80ML covers 32 A to 80 A with WiFi or 4G.
Circuit Breaker products
WTM7-63 4P DC Miniature Circuit Breaker MCB
WTM7-63 4P DC miniature circuit breaker for 1000 V DC: four poles on one handle, 6 kA, C curve, 6 to 63 A, polarity marked terminals, 72 mm body.
WTB2-80ML(Wifi) Smart Circuit breaker
WiFi Remote Control: Built-in WiFi connectivity enables app-based on/off, scheduling and instant alerts from anywhere, without a separate gateway. Built-in Residual Protection: AC type residual current protection with 30mA, 50mA, 100mA and 300mA settings for leakage and shock safety. Real-time
WTB2-80ML(4G) Smart Circuit breaker
Smart Remote Control: 4G and WiFi communication with Bluetooth and RS485 support, enabling remote on/off, status checks and alerts through the app. Built-in Residual Protection: AC type residual current protection with 30mA, 50mA, 100mA and 300mA settings for leakage and
WTCM1-250 Moulded Case Circuit Breaker
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
WTM7-63 DC Circuit Breaker
WTM7-63 DC Miniature Circuit Breaker (DC MCB) DC Voltage Coverage: Rated voltage from DC 250V in 1P configuration up to DC 1000V in 4P configuration, matching the pole count to the DC system voltage. Complete Ratings Range: Rated current from
WTB1-63 AC Circuit breaker
WTB1-63 1-4P ACCB with residual current protection. 4-pole, 20A rated.
WTB2-80ML 2P IOT WIFI Smart Circuit Breaker
WTB2-80ML 2P IOT WIFI Smart Circuit Breaker. Remote control via WiFi/RS-485/Bluetooth, smart metering.
WTB2-80ML 2P IOT 4G Smart Circuit Breaker
WTB2-80ML 2P IOT 4G Smart Circuit Breaker. Remote control via 4G/RS-485/Bluetooth, smart metering.
Send the Circuit List and the Fault Level
Tell us the circuits, the supply voltage and the prospective fault current at the board. We reply within 24 hours with the breaker for each circuit, the curve and the breaking capacity that covers the fault level.
BEFORE YOU ORDER
Breaking Capacity, Curve and Pole Count
Breaking capacity is the first number that gets missed. It is the fault current the breaker can interrupt, and it has to exceed the prospective fault current at the board. A 4.5 kA breaker on a board with a 10 kA fault level will not clear the fault safely, however correct the current rating looks.
The curve is the second. B suits lighting and long cables, C suits motors and mixed loads, and D suits welders and transformers with high inrush. A B curve on a compressor trips on a healthy start; the fix is the curve, not a bigger breaker.
The pole count is the third. A 1P+N device breaks the live pole and switches the neutral without a rated breaking capacity in it. A 2P device breaks both poles. Where the neutral must be isolated, 2P is the answer.
Send the fault level with the circuit list and the first choice is already narrowed.
COMMON QUESTIONS
Frequently Asked Questions
An RCCB protects a group of circuits against earth leakage but has no overcurrent protection, so each circuit still needs an MCB. An RCBO combines both in one device, which takes less space and clears only the faulted circuit, but costs more per way.
It is the fault current the breaker can interrupt without being damaged. A 4.5 kA breaker on a board with a 10 kA fault level may fail to clear the fault safely. Check the prospective fault current before choosing the rating.
No, above very low voltages. AC breakers rely on the current crossing zero to extinguish the arc, and direct current never does. A DC breaker has a deeper arc chamber and a wider contact gap, and the pole count sets the voltage rating.
B trips at three to five times rated current for lighting and long cables. C trips at five to ten times for motors and mixed loads. D trips at ten to twenty times for welders, transformers and high-inrush equipment.
Size on the cable ampacity first, so the cable is protected, then check the load current sits below the rating and the starting current below the magnetic trip. For an air-conditioning circuit, use the nameplate minimum circuit ampacity and maximum breaker size instead of a rule of thumb.
Yes. Logo printing, private-label cartons and rating labels are handled at our plant in Liushi, Yueqing. Send the artwork and the model list, and we confirm what can be changed for each frame.
CONTACT US
Start Your Electrical Project Today
Send your application, voltage, certifications and quantity to this electrical protection manufacturer. We reply with a quotation within 24 hours.
- Engineering review by an electrical protection manufacturer before quoting
- Plant pricing with no intermediaries
- Export packing and shipping handled in one place
- One order owner from quotation to delivery