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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 5SY4125-7 |
| Alternative Part Number | 5SY41257 |
| Manufacturer | Siemens |
| Product Type | Miniature Circuit Breaker |
| Rated Voltage | 400 V AC/DC |
| Interrupt Rate | 10 kA |
| Dimensions | 90 x 18 x 76 mm |
| Number of Poles | 1 |
| Tripping Characteristic | Type C |
| Mechanical Life | Typically 10,000 cycles |
| Insulation Voltage | Up to 440 V AC |
| Connectable Conductor Size | Solid or stranded: 0.75 mm² to 35 mm² |
| Finely Stranded Conductor | With wire end processing: 0.75 mm² to 25 mm² |
| Tightening Torque | 2.5 N·m to 3 N·m |
| Ambient Temperature Range | Operational: -25°C to +55°C, Storage: -40°C to +75°C |
| Installation Depth | 70 mm |
| Width | 18 mm (1 modular width unit) |
| Mounting Position | Any |
| Net Weight | 162 g |
| Environmental Conditions | Vibration resistance as per IEC 60068-2-6 |
| Product Features | Touch protection, halogen-free, sealable, silicon-free |
The Siemens 5SY4125-7 is a robust miniature circuit breaker designed to provide reliable overcurrent protection for electrical circuits. Engineered for both AC and DC applications, this MCB operates at a rated voltage of 400 V and has a notable interrupt rate of 10 kA, ensuring effective disconnection in the event of a fault. Its compact dimensions of 90 x 18 x 76 mm allow for efficient use of space within electrical installations.
This circuit breaker is a single-pole device, characterised by a C tripping curve, making it suitable for protecting installations with a moderate inrush current, such as small motors and lighting circuits. The 5SY4125-7 is designed for quick assembly, with a mounting depth of 70 mm, and can be installed in any position, providing flexibility in various applications.
Constructed with safety and durability in mind, the 5SY4125-7 features touch protection and is sealable to prevent tampering. It is also halogen-free and silicon-free, minimising environmental impact and ensuring compliance with industry standards for material safety.
The MCB's mechanical life is rated for 20,000 operating cycles, indicating a long-lasting and reliable performance for mechanical engineering and industrial environments. With its ability to handle a rated current of 25 A and its compliance with overvoltage category III, the Siemens 5SY4125-7 is an essential component for safeguarding electrical systems against overcurrent conditions.
Commonly Asked Questions
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Frequently Asked Questions
What type of circuit breaker is this?
This is a miniature circuit breaker designed for quick assembly, suitable for protecting electrical circuits from overcurrent and short circuit.
Can this circuit breaker be used in any mounting position?
Yes, the circuit breaker can be installed in any position, providing flexibility in various applications.
What is the tripping characteristic of this circuit breaker?
The tripping characteristic class of this circuit breaker is C, which means it is designed to trip at a current range of 5 to 10 times its rated current, making it suitable for commercial and industrial applications with moderate inrush currents.
What is the rated current for this circuit breaker?
The rated current for this circuit breaker is 25A.
What is the rated voltage for this circuit breaker?
The rated voltage for this circuit breaker is 400V for AC systems.
What is the breaking capacity of this circuit breaker?
The breaking capacity of this circuit breaker is 10 kA according to EN 60898.
Is this circuit breaker sealable?
Yes, the circuit breaker is designed with a feature that allows it to be sealed for safety and security purposes.
What is the degree of pollution for this circuit breaker?
The degree of pollution for this circuit breaker is 3, which indicates that it is designed to operate in environments where conductive pollution occurs or dry, non-conductive pollution becomes conductive due to condensation.
What are the dimensions of this circuit breaker?
The dimensions of the circuit breaker are 90 x 18 x 76 mm.
What is the ambient temperature range for operating this circuit breaker?
The ambient temperature range for operating this circuit breaker is from -25°C to +55°C.
Is this circuit breaker halogen-free?
Yes, the circuit breaker is halogen-free, making it safer in terms of fire and corrosion resistance.
Can supplementary devices be installed with this circuit breaker?
Yes, the circuit breaker is designed to allow the installation of supplementary devices for enhanced functionality.
