Motor protection S24
S24 motor protection: S24 adjustable thermal-magnetic protection for small electric motors.
- Range: 2.5-4A and 4-6.3A adjustment options.
- Protection: thermal and magnetic response for motors.
- Series: S24 format for compact modular boards.
- Use: pumps, fans, compressors and small machinery.
S24 motor protection circuit breakers: adjustable motor protection
Solera S24 motor protection circuit breakers combine thermal protection against overloads, magnetic protection against short circuits and phase-failure protection. The two published references, S24GM4 and S24GM6.3, are three-pole devices for alternating current. They provide two separate adjustment ranges covering 2.5 to 6.3 A, allowing the range to be selected to suit the motor.
S24GM4 and S24GM6.3 compared
| Reference | Adjustment range | Poles | Modular width |
|---|---|---|---|
| S24GM4 | 2.5–4 A | 3P | 2.5 modules of 18 mm |
| S24GM6.3 | 4–6.3 A | 3P | 2.5 modules of 18 mm |
Applications and selection criteria
These devices are used in motor protection and control panels, for example for pumps, fans or small machinery, provided the electrical characteristics and starting conditions suit the selected protection. The data sheets identify industrial environments as a typical application. Start selection with the motor nameplate current for its actual voltage and connection; power in kW alone does not determine the reference.
Both data sheets specify 230/400 V AC, 50/60 Hz, mounting on a 35 mm DIN rail and an ambient operating temperature of −5 to +40 °C. Check available space, the connection diagram, conductor cross-sections and panel mounting conditions. Membership of the S24 series does not establish compatibility with every accessory or device in the range.
In addition to the adjustment range, check motor starting behaviour, the breaking capacity required by the installation and coordination with upstream protection. Do not assign an S24 MCB’s breaking capacity to a motor protection circuit breaker merely because they share the same series name. Consult the specific product data and documentation before defining the assembly.
Frequently asked questions
Which reference should be used for a 4 A motor?
4 A is the upper limit of S24GM4 and the lower limit of S24GM6.3. Both ranges include this value; the final choice requires checks on starting conditions, connection and circuit coordination. Do not automatically choose the larger reference or increase the setting to avoid tripping without investigating the cause.
Does a motor protection circuit breaker replace a contactor?
They perform different functions: the circuit breaker protects the motor, while the contactor provides electrical switching of the circuit. Where remote control or repeated switching is needed, assess the assembly and check the utilization category, motor current and coordination. Universal compatibility between any motor protection circuit breaker and any S24 modular contactor is not declared.
Do these devices include residual current or surge protection?
The S24GM4 and S24GM6.3 data sheets declare thermal, magnetic and phase-failure protection. They do not declare residual current or overvoltage protection. These functions must be provided separately where required by the installation.