BTicino Megatiker M3 160 Circuit Breaker

1. Power loss per pole (In=160A)

Circuit breaker (Icu ≤ 50kA)

Connection method Power loss (W)

Terminal block 15.62

Expansion terminal 18.18

Rear wiring terminal 24.58

Circuit breaker (Icu>50kA)

Connection method Power loss (W)

Terminal block 16.64

Expansion terminal 18.18

Rear wiring terminal 24.58

disconnecting switch

Connection method Power loss (W)

Terminal block 12.80

Expansion terminal 15.36

Rear wiring terminal 21.76

2. Temperature reduction

The ambient temperature has a significant impact on the current carrying capacity of circuit breakers. The following table shows the maximum continuous operating current (160A rated value) at different temperatures:

Environmental temperature (° C) -20-10 0 10 20 30 40 50 60 70

Maximum current (A) 201 193 189 187 179 173 166 160 146 138

3. Altitude Capacity Reduction

When the installation altitude exceeds 2000 meters, it is necessary to reduce the capacity according to the following coefficient:

Altitude (m) ≤ 2000 3000 4000 5000

Working voltage Ue (V) 690 590 520 460

Rated current In 1 × In 0.98 × In 0.93 × In 0.9 × In

Accessories and Options

The M3 160 series offers a wide range of electrical and mechanical accessories to meet different application needs.

1. Release device

Split release (ST)

Voltage specifications: 12V, 24V, 48V, 110-130V, 220-277V, 380-480V (AC/DC)

Maximum power: 400 VA/W

Action time:<50 ms

Undervoltage Release (UVR)

Voltage specifications: 12V, 24V, 48V, 110-130V, 220-240V, 277V, 380-415V, 440-480V (AC/DC)

Maximum power: 4 VA

Action time:<50 ms

Delay module: can be equipped with 800ms delay module (M7000MR/230, M7000MR/400)

2. Auxiliary contacts

Model: M7X01

Contact form: 1NO/NC conversion contact

Rated current: 3A @ 250V AC

Purpose: To indicate the opening and closing status or fault tripping status of the circuit breaker

Configuration: M3 160 supports a maximum of 1 auxiliary contact and 1 fault signal contact

3. Rotate the handle

Type and Model Description

Direct standard M7R20 black handle

Direct emergency M7R21 red/yellow handle

Variable depth standard M7R22 IP55, black

Variable depth emergency M7R24 IP55, red/yellow

4. Lock attachments

Padlock: M7X02, used to lock in the "off" position

Keylock: Universal lock core, supports random or fixed coding (EL43525, EL43363)

5. Connect attachments

Cage terminal

Standard type: Supports Cu/Al cables, maximum 70mm ² (Cu)/95mm ² (Al)

High Capacity Type: Supports up to 70mm ² (Cu)/95mm ² (Al), suitable for applications above 80A

Expansion terminal and rear wiring terminal

Expansion terminals: M7A50 (3P), M7A51 (4P)

Rear wiring terminals: M7A54 (3P), M7A55 (4P)

6. Protective accessories

Terminal protective cover: M7C20 (3P), M7C21 (4P), IP2X protection

Inter phase insulation partitions: M7F01 (3P), M7F02 (4P)

7. Mechanical interlocking

M7O1: Standard mechanical interlock (fixed type)

M7O2: Mechanical interlock with electronic module

M7O4: Interlocking installation board

Release curve and current limiting curve

1. Thermal magnetic release curve

The M3 160 circuit breaker provides two types of trip curves based on the rated current:

In ≤ 50A: The curve contains both cold and hot characteristics, with a fixed instantaneous trip value of 12.5 × In or 16 × In

In>50A: The instantaneous trip value is fixed at 10 × In, and the overload protection has thermal memory characteristics

The action time under cold state (curve 1) and hot state (curve 2) is clearly marked in the curve graph, which facilitates the coordination of upper and lower level protection.

2. Through the energy curve (I ² t)

The document provides I ² t curves for two levels of breaking ability:

Icu ≤ 50kA

Icu > 50kA

Energy is an important indicator for measuring the current limiting capability of circuit breakers, and a lower I ² t value means better protection for downstream equipment.

3. Peak current cut-off curve

The peak current cutoff curve shows the peak current that a circuit breaker can limit in the event of a short circuit fault. The curve, with the expected short-circuit current (RMS) as the horizontal axis and the actual allowable peak current as the vertical axis, intuitively reflects the current limiting performance of the circuit breaker.

DC application

The M3 160 circuit breaker and isolation switch are also suitable for DC systems, and the appropriate number of poles in series should be selected according to the voltage level.

1. DC breaking capacity (circuit breaker)

Pole series 60V DC 110V DC 250V DC

1 pole 36 kA --

2-pole series 35 kA 35 kA 10 kA

3-pole series 35 kA 35 kA 10 kA

Note: The above data applies to ungrounded DC networks with voltage tolerances ranging from 0% to+5%.

2. DC usage category (isolating switch)

The MS3 160 isolation switch is suitable for use in DC applications in the DC-23A category, with the following specific configuration:

Pole series 60V DC 110V DC 250V DC 500V DC

1-pole DC-23A --

2-pole series DC-23A DC-23A DC-23A-

3-pole series DC-23A DC-23A DC-23A-

4-pole series connection DC-23A DC-23A DC-23A DC-23A

Compliance and Certification

The Megatiker M3 series products comply with the following standards and regulations:

Product standards: IEC/EN 60947-2 (circuit breaker), IEC/EN 60947-3 (isolating switch)