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Functions
Overload protection
Short circuit protection
Isolation
Controlling
Used in residential building, non-residential building, industry, energy and infrastructure
Technical Specifications
Standard: IEC 60947-2
Rated current In (A): 80, 100, 125
Rated voltage Un (V AC): 230/400
Operational voltage (V AC): Min: 24; Max: 250/440
Number of poles: 1, 2, 3, 4
Trip characteristic: C, D
Characteristic C (In): 8
Characteristic D (In): 12
Thermal operating limit (In): (1.05-1.3)
Degree of protection: IP20, with connected conductors
Electrical life (times): 4,000
Mechanical life (times): 10,000
Breaking capacity:
Model | Rated voltage(V) | Acc. to IEC 60947-2 | ||
Icu(kA) | Icu(kA) | |||
3SB71-125 | 1P | 230/400 | 10 | 7.5 |
2-4P | 400 | 10 | 7.5 |
Mounting position: Any
Conductor cross-sections
Solid and stranded (mm²): 1-50
Finely stranded with end sleeve (mm²): 1-35
Terminal tightening torque (N·m): 2.8
Ambient temperature (°C): -25 ~ +45, max. 95 % humidity
Storage temperature (°C): -40 ~ +75
Altitude (meters): Max 2,000
References
Additional components: page 189 ~ 191
Instruction of Type Code
Features
Rated current up to 125 A
The handle being sealable or equipped with padlock bracket avoids dangerous operation changes (ON / OFF)
The handle provides a clear indication of the contact position
Adequate printing of all data on the front provides long-term identification
Energy limiting class: 3
The emission of ionized gases is limited to the severest restrictions: 45 mm grid distance
This MCB for industry in accordance with IEC 60947-2 instantaneous tripping characteristic release B 4 In, release C 8 In, release D 12 In.
This MCB may be extended with:
A wide range of RCDs and RCBO
Full sets of additional components
Full sets of accessories
Add-on Devices
Auxiliaries
Selection and Ordering Data
Tripping Characteristic
IEC 60947-2 Standard
Magnetic Release
An electromagnet with plunger ensures instantaneous tripping in case of short circuit
The standard leaves the calibration of magnetic release to manufacturer’s decision.
Sassin MCB series 3SB71-125 offers instantaneous tripping ranges
release C: 8 In
release D: 12 In
Thermal Release
The release is initiated by a bimetal strip in case of overload
The standard defines the range of release for two specific overload values
Reference ambient temperature is 30 ºC
Test current | Tripping time |
1.05 In | t ≥ 2 h (In > 63 A) |
1.30 In | t < 2 h (In > 63 A) |
Outline and Installation Dimensions
3SB71-125 is installed on DIN rail