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3SB71-125, high current, 10 kA

Independent power supply with build-in power source,directly draws power from the incoming end to avoid the risk of protection function failure caused by external power supply failure.

● Overload protection
● Short circuit protection
● Isolation
● Controlling
● Used in residential building, non-residential building, industry, energy and infrastructure
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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


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