Ordinary Discount Miniature circuit breaker-FTB3 to Kyrgyzstan Factories


Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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Product illustration:


Product Features

- A breaking capacity of 12kA up to 32A and 10kA between 40 to 63A.

- Current-limiting scheme: in the event of a short circuit, are able to limit the let-through current to 60%-70% of the rated current.

- The trip mechanism ensures perfect closure every time,thereby considerably improving the performance of these devices and extending their average lifetime.

-The arc extinguishing system: allows the short-circuit currents of very high value to be interrupted extremely rapidly, the remarkable opening speed of contacts opening and the structure of the arcing chamber contribute to extinguishing the arc in the shortest possible time, ensuring reliable protection of short-circuit.

- The internal contact position allows an exact information of the circuit-breaker status: “green”,open contacts;“red”,closed contacts,independently of the toggle position.

- Sealing/locking sealable with 1 mm wire, to prevent unwanted tripping.

- The supply lines of the protected circuit can be connected to either the upper or lower terminals of the circuit-breakers(reversibility of connections).

- The double terminal of these circuit-breakers enables simultaneous connection of cables and busbars.

Technical Data


Breaking capacity(KA) 40-63A 10
6-32A 12
Mechanical and electrical life: 20,000 operation
Protection rating IP20
Installation On symmetrical DIN rail 35mm /Panel Mounting
Connection capacity: Cross-section of conductors up to 25mm², Cross-section of busbar from 0.8-2mm², reversibility of connections
Ambient temperature (°C) -5°C ~ +40°C
Altitude (m) not higher than 2000m
Relative air humidity no more than 95%
Pollution degree
Weight (g) 116 234 352 472

Tripping characteristic


Exterior and dimensions




Number of poles

1P 2P 3P 4P
a 80±0.8
b 74.2±0.8 75.7±0.8
c 17.8±0.5 35.6±0.8 53.4±0.8 71.2±0.8
d 44±0.8
e 68.7±0.8 70.2±0.8
f 45±0.8
g 35.5±0.8


Please refer to below table for the connection of wires with a cross section area

Rated current In(A) Nominal cross section area of copper wire(mm²)
1~6 1
10 1.5
16,20 2.5
25 4
32 6
40,50 10
63 16

  • Problem 1 Effect of Temperature Upon Resistance

    2 Problem 1 Effect of Temperature Upon Resistance

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    contents :

    Chapter 14: Current Electricity (55 videos)

    14:1: Electric Current
    1. Introduction to Electric Current
    2. More on Introduction to Electric Current
    3. Problem-Introduction to Electric Current
    4. Problem 1-Measurement of Current

    14.2: Conventional current
    1. Conventional Current

    14.3: Potential Difference and emf
    1. Potential Difference
    2. Problem-Potential Difference
    3. Problem 1-Measurement of Potential Difference
    4. Problem- Potential Divider
    5. Electromotive Force
    6. Problem-Electromotive Force
    7. Problem- Measurement of e.m.f

    14.4: Ohm’s Law
    1. Ohms Law

    14.5: Resistance
    1. Resistance
    2. Problem-Determining the Resistance of a Load
    3. Problem- Resistor

    14.6: Specific Resistance of Resistivity
    1. Specific Resistance
    2. Problem 1-Specific Resistance
    3. Problem 2-Specific Resistance

    14.7: Effect of Temperature on Resistance
    1. Effect of Temperature on Resistance
    2. Problem 1-Effect of Temperature Upon Resistance
    3. Problem 2-Effect of Temperature Upon Resistance

    14.8: Combinations of Resistors
    1. Series combination of Resistors
    2. Problem 1-Series Combination of Resistors
    3. Parallel Combination to Resistors
    4. More on Parallel Combination to Resistors
    5. Problem 2-Series Combination of Resistors
    6. Problem-Current in Series Circuit
    7. Problem 1-Parallel combination to Resistors
    8. Problem 2-Parallel combination to Resistors
    9. Problem 3-Parallel combination to Resistors
    10. Problem 4-Parallel combination to Resistors

    14.9: Conductors and Insulators
    1. Conductors and Insulators

    14.10: The I-V Characteristics for OHMIC and Non OHMIC Conductors
    1. Characteristics of Ohmic and Non Ohmic Conductors
    2. Problem-Characteristics of Ohmic and Non Ohmic Conductors

    14.11: Electrical Power and joule Law
    1. Problem 1-Electrical Energy and Joules law
    2. Electrical Energy and Joules law
    3. Problem 2-Electrical Energy and Joules law
    4. Electric Power
    5. Kilowatt Hour
    6. Problem 1-Electric Power
    7. Problem 2-Electric Power

    14.12: Direct Current (D.C) and Alternating Current (A.C)
    1. Direct Current
    2. Alternating Current

    14.13: Circuit Components
    1. Circuit Components

    14.14: Measuring Instruments
    1. Introduction to Galvanometer
    2. Introduction to Ammeter
    3. Introduction to Voltmeter

    14.15: Series and Parallel Circuit
    1. Series combination of Resistors
    2. Parallel Combination to Resistors

    14.16: House Circuit
    1. House Wiring

    14.17: Electricity Hazards
    1. Insulation Damage and Damp Conditions
    2. Introduction to Fuse
    3. Introduction to Circuit Breaker
    4. Introduction to Earth Wire

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