BTicino Megatiker M4 Thermal magnetic and MS4 trip-free switches

The BTicino brand Megatiker M4 thermal magnetic circuit breaker and MS4 isolation switch have a rated current coverage of 250A-630A and a breaking capacity of 36kA-100kA. The rated current of the isolation switch is 400A/630A, both supporting 3P/4P/3P+N/2 poles, vertical/horizontal panel installation, working temperature of * * -25~70 ℃ * *, mechanical life of 20000 times, and electrical life of 4000-8000 times; Equipped with a variety of accessories such as leakage modules, release devices, and motor operating mechanisms, following the IEC/EN 60947 standard, it is suitable for overload/short circuit protection and power isolation requirements in large industrial power distribution, ships, and other scenarios.

Core products and basic configurations

Product positioning and applicable scenarios

Both products are core equipment for large-scale power distribution systems, suitable for medium and high voltage scenarios such as industry and ships;

M4 circuit breaker: used for overload and short circuit protection, supports “forward/reverse” power supply, and can expand leakage protection;

MS4 isolation switch: used for power isolation, ensuring maintenance safety, and compatible with circuit breaker cooperation.

Core physical parameters

|Product type | Number of poles | Size (W × H × D, mm) | Weight (kg, fixed version) | Standard accessories|

|M4 circuit breaker | 3P | 140 × 260 × 105 | In ≤ 400A: 5.2; In ≥ 500A: 5.4 | Fixed screws (4 pieces), connecting screws (6 pieces), phase insulator (2 pieces)|

|M4 circuit breaker | 4P | 183 × 260 × 105 | In ≤ 400A: 6.55; In ≥ 500A: 6.85 | Fixed screws (4 pieces), connecting screws (8 pieces), phase insulator (3 pieces)|

|MS4 isolation switch | 3P | 140 × 260 × 105 | In ≤ 400A: 5.0; In ≥ 500A: 5.25 | Consistent with the circuit breaker|

|MS4 isolation switch | 4P | 183 × 260 × 105 | In ≤ 400A: 6.4; In ≥ 500A: 6.68 | Consistent with the circuit breaker|

Key technical parameters (electrical and mechanical)

（1） M4 Thermal Magnetic Circuit Breaker

Electrical parameters

Insulation and Voltage: Rated insulation voltage Ui=800V, rated operating voltage Ue=690V (AC 50/60Hz), impulse withstand voltage Uimp=8kV;

Breaking capacity (Icu): Divided into four levels by model, as shown in the table below:

Model suffix breaking capacity (Icu) 415V AC Icm (kA) 240V AC Icu (kA) 690V AC Icu (kA)

F 36kA 76.5 70 14

N 50kA 105 100 18

H 70kA 154 105 20

L 100kA 220 150 22

Protection features: Thermal trip Ir=0.8-1 × In (adjustable), magnetic trip Ii=5-10 × In (adjustable), 4P version neutral pole protection with 100% phase pole capacity, 3P+N/2 version neutral pole current adaptation as follows:

Rated current In (A) 320 400 500 630

Neutral pole protection current (A) 200 250 320 400

Power consumption: The unipolar power loss varies with the connection method and current, as shown in the following table (example):

Connection method 250A (Phase/W) 400A (Phase/W) 630A (Phase/W)

Cage terminal 19.2 25.6 37.3

Expander 20.6 29.3 44.7

Rear terminal 20.4 28.7 45.0

Plug in version 26.7 44.9 85.3

mechanical parameters

Operating force: varies with current specifications, as shown in the table below:

Operation type In ≤ 400A (N) In ≥ 500A (N)

Open switch 80 130

Close 180 210

Reset 145 200

Lifespan: 20000 mechanical operations, 8000 electrical operations at rated current, 4000 operations at 0.5In;

Electric power protection: In case of short circuit, the distance between the conductor and the circuit breaker should be ≥ 200mm (100kA breaking capacity) and ≥ 350mm (36kA breaking capacity).

（2） MS4 isolation switch

Core parameters

Electrical: Rated insulation voltage Ui=800V, rated working voltage Ue=690V, short-time withstand current Icw=5kA (400A)/8kA (630A), rated closing current Icm=8kA (400A)/14kA (630A);

Power consumption: Single pole power loss (at 400A): cage terminal 25.6W, expander 29.3W, rear terminal 28.7W; at 630A, it is about 1.45 times that of the corresponding 400A version;

Lifespan: Consistent with the circuit breaker (20000 mechanical cycles, 4000 electrical cycles), utility category AC23A (400A)/AC22A (630A).

Installation requirements and accessory compatibility

Installation specifications

Installation method: Vertical/horizontal installation of the panel, supporting forward (LINE/LOAD identification) or reverse power supply (no identification);

Cable adaptation: Both copper and aluminum cables are supported, and the maximum cross-sectional area of standard cage terminals is flexible 240mm ² and rigid 300mm ²; High capacity terminals: flexible 185mm ², rigid 240mm ²;

Special installation: Supports plug-in (with M7B13/M7B14 base) and pull-out (with M7B22/M7B23 mechanism), with pull-out supporting “connect test pull-out” three positions.

Accessory system (fully compatible)

The accessory category represents the core functional key parameters of the product

Release M7C024 (excitation) remote disconnection 24Vac/dc, power 300VA/W, disconnection time ≤ 50ms

Release M7T024 (undervoltage) undervoltage protection 24Vac, trip voltage 35-70% Vn, power consumption 5VA

Leakage module T7081/400 leakage protection 400A, I Δ n 0.03-3A, Δ t 0-3s, Type A-S

Auxiliary contact M7X01 status feedback 3A/250VAC, 1NO/NC, supports fault signal output

Rotating handle M7447 (standard) manual operation black, compatible with 3P/4P products

Rotating handle T7449E (emergency) emergency operation red/yellow, IP55 protection

Motor operation M74D230 electric opening and closing 230Vac, closing time 550ms, mechanical life 10000 times

Connect accessories M7400 cage terminals 4 pieces/set, compatible with 300mm ² rigid cables

Installation accessory M7B13 plug-in base 3P, compatible with front-end terminal circuit breaker

Capacity reduction characteristics and compliance

Capacity reduction requirements

Temperature reduction: When the ambient temperature is 70 ℃, the 630A model In=536A (0.85 × 630A); At 10 ℃, In=630A (1 × 630A);

Capacity reduction at altitude: Capacity reduction is required when the altitude is greater than 2000m, as shown in the table below:

Altitude (m) Rated working voltage Ue (V) Rated current In (A)

2000 690 1×In

3000 590 0.98×In

4000 520 0.93×In

5000 460 0.9×In

DC application: A 1-pole circuit breaker with a breaking capacity of 35-100kA at 60Vdc and 35-70kA at 250Vdc (to be used in series).

Compliance and Identification

Following standards: IEC/EN 60947-2 (circuit breaker), IEC/EN 60947-3 (isolating switch), certified by IECEE CB/LOVAG, with local certifications such as CCC (China) and EAC (Eurasia);

Special compliance: Complies with ship regulations (Lloyds, RINA, BV), meets REACH, RoHS environmental directives;

Identification requirements: The manufacturer, model, and breaking capacity should be laser marked on the front (color identification), and the barcode and country of production should be labeled on the side sticker.