Fast delivery for DC miniature circuit breaker-FTBD for Korea Importers


Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

Related video

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Product illustration:


Technical Data

Model FTBD DC miniature circuit-breaker
Number of poles IP 2P
Rated frequency: AC 50/60Hz
Rated voltage (V) 125/250 250/500
Rated current (A) 1,2,3,4
Rated ultimate short-circuit breaking capacity(KA) 6.5
Rated current (A) 6,10,16,20,25,32,40,50,63
Rated ultimate short-circuit breaking capacity(KA) 20/10 20/10
Rated impulse withstand voltage Uimp(KV) 4
Mechanical and electrical life: 20000
Protection rating IP20
Installation On DIN rail 35mm according to JB6525
Connection capacity: Cross-section of conductors up to 25mm2, Cross-section of busbar from 0.8-2mm2
Ambient temperature (°C) -25°C ~ +45°
Altitude (m) ≦4000m
Relative air humidity no more than 95%
Pollution degree
Installation condition Used in place without obvious shock and vibration
Weight (g) 116 232

Tripping characteristic


Exterior  and dimensions


Number  of poles 1P 2P
A 80±0.8
B 74.2±0.8 75.7±0.8



D 44±0.8



F 45±0.8
G 35.5±0.8

I found this video on my hard drive the other day. This video is about a year old.

This was an experimental capacitor bank charger, and I realized I forgot to disconnect the mains power from the charger before discharging the bank. The essentially shorted the mains, blowing the circuit breaker. At least it looked cool…

Watch the full episode:

Ask This Old House master electrician Scott Caron visits Alaska to install a portable generator with a manual transfer switch to power hardwired appliances like a well pump and heating system using unleaded gasoline.

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Time: 3 hours

Cost: $3,000

Skill Level: Moderate

Tools List for Installing a Manual Transfer Switch for a Portable Generator:
Lineman’s pliers
Wire strippers

Shopping List:
Portable gas generator
10-circuit manual transfer switch
Power inlet
10-3 non-metallic wiring
Wire nuts

1. Mount the manual transfer switch near the main electric panel.
2. Select up to 10 circuits to be powered by the generator (240 volt circuits require two spots on the transfer switch).
3. Turn off power to the house at the main electric shut off.
4. Remove the cover on the main electric panel (work inside the electric panel is only recommended for licensed electricians).
5. Locate an available knockout hole on the electric panel and remove the plug. Attach the armored cable from the transfer switch to the electric panel.
6. Connect the ground and neutral wires from the transfer switch to the appropriate bus bars on the main panel.
7. Locate the first circuit to be powered by the generator and remove the power wire on the existing circuit breaker. Replace that wire with the red wire from the transfer switch marked “A.” Splice the black wire marked “A” from the transfer switch to the removed power wire using a wire nut. Repeat this process for all 10 circuits, ensuring the red and black wires from the transfer switch are a matched pair.
8. Use 10-3 non-metallic wiring to connect the transfer switch to a power inlet outside.
9. Use the provided generator cord to connect the power inlet to the generator (or make your own cable if a longer one is desired using bulk wire and connectors).
10. Ensure the generator has unleaded fuel and oil inside, then start the generator.
11. To test the wiring connections, flip the switches on the transfer switch from “Line” to “Gen.” The generator should power the selected circuits.

Follow This Old House and Ask This Old House:


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