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EMAS MKS1TM-4 EMAS MOTOR PROTECT CIRCUIT BREAKER (2.50-4.00 A)
EMAS MKS1TM-4 three-pole motor protection circuit breaker with an adjustable 2.5 to 4 A thermal range, phase-failure protection and a minimum 6 kA breaking capacity at 400 V.
£50.53
Why Choose the EMAS MKS1TM-4 Motor Protection Circuit Breaker?
The EMAS MKS1TM-4 is a compact and dependable motor protection circuit breaker designed to protect three-phase electric motors against overloads, short circuits and phase failure. Part of the EMAS MKS series, it combines adjustable thermal overload protection with fixed magnetic short-circuit protection, providing an effective solution for industrial motor control panels and machinery.
Its adjustable thermal calibration range of 2.5 to 4 A allows the trip setting to be matched closely to the rated current of the connected motor. The fixed magnetic release is set at approximately 12 times the operational current, enabling rapid disconnection when a severe short-circuit fault occurs.
The MKS1TM-4 also incorporates phase-failure protection and ambient temperature compensation to support consistent performance in demanding applications. Designed for straightforward installation on a standard 35 mm DIN rail, it is suitable for motor control centres, OEM equipment, pumps, fans, conveyors and automated production machinery.
Key Advantages
- Adjustable 2.5 to 4 A thermal overload protection.
- Protects motors against overload, short circuit and phase failure.
- Fixed magnetic short-circuit release set at approximately 12 × Ie.
- Minimum 6 kA short-circuit breaking capacity at 400 V.
- Temperature-compensated mechanism supports reliable tripping performance.
- Compact construction for standard 35 mm DIN rail mounting.
Key Features
- EMAS MKS series motor protection circuit breaker.
- 2.5 to 4 A adjustable thermal current range.
- Three-pole construction for three-phase motor circuits.
- AC-3 utilisation category.
- Integrated protection against phase failure.
- 690 V AC rated insulation voltage.
- 6 kV rated impulse withstand voltage.
- IP40 front protection rating.
Reliable Motor Overload and Short-Circuit Protection
Motor protection circuit breakers monitor the current supplied to a motor and disconnect the circuit when unsafe operating conditions occur. The adjustable thermal release responds to prolonged overloads that could cause overheating, while the magnetic release provides fast interruption during high-current short circuits.
The EMAS MKS1TM-4 also protects against phase failure, helping prevent excessive current, reduced torque and overheating in three-phase motors. Its adjustable setting makes it possible to coordinate the breaker with the motor's rated current, supporting dependable protection without unnecessary interruptions.
Typical Applications
- Three-phase induction motor protection.
- Industrial pumps, fans and compressors.
- Conveyors and material handling equipment.
- Packaging and processing machinery.
- Motor control centres and automation panels.
- OEM machinery and manufacturing equipment.
Technical Specifications
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| Current | 4 A | |
|---|---|---|
| Application | Motor protection | |
| Actuator Type | Push Button | |
| Terminal Type | Screw Terminal | |
| Current Range | 2.5–6.3 A | |
| Poles | 3-pole | |
| Device Type | Motor protection breaker | |
| Breaking Capacity | 6 kA | |
| Manufacturer | EMAS | |
| Series | MKS | |
| Model | MKS1TM-4 | |
| Product type | Motor protection circuit breaker | |
| Thermal adjustment range | 2.5 to 4 A | |
| Number of poles | 3 | |
| Operational frequency | 50 / 60 Hz | |
| Utilisation category | AC-3 | |
| Magnetic release setting | Fixed at approximately 12 × Ie | |
| Short-circuit breaking capacity | Minimum 6 kA at 400 V | |
| Rated insulation voltage (Ui) | 690 V AC | |
| Rated impulse withstand voltage (Uimp) | 6 kV | |
| Dielectric strength | 1890 V contact-to-contact | |
| Insulation resistance | Minimum 10 MΩ at 500 V DC | |
| Mechanical endurance | Minimum 100,000 operations | |
| Electrical endurance | Minimum 100,000 operations | |
| Maximum operating frequency | 360 operations per hour | |
| Operating temperature | -5 to +40 °C | |
| Pollution degree | 3 | |
| Protection rating | IP40 | |
| Supported conductor size | 0.75 to 4 mm² | |
| Terminal tightening torque | 1.8 N·m | |
| Mounting type | 35 mm DIN rail | |
| Applicable standard | TS EN 60947-4-1 |
Frequently Asked Questions
What is the EMAS MKS1TM-4 used for?
It is used to protect three-phase electric motors against overload, short circuit and phase failure in industrial machinery and control-panel applications.
What current range can the MKS1TM-4 be adjusted to?
The thermal overload setting can be adjusted between 2.5 and 4 A to match the rated current of the connected motor.
What is the short-circuit breaking capacity?
The MKS1TM-4 has a minimum short-circuit breaking capacity of 6 kA at 400 V.
Does the MKS1TM-4 provide phase-failure protection?
Yes. It includes phase-failure protection to help protect three-phase motors from overheating and damage caused by the loss of a supply phase.
How is the EMAS MKS1TM-4 installed?
The circuit breaker is designed for mounting on a standard 35 mm DIN rail inside an electrical control panel or enclosure.
Trusted for Industrial Motor Protection
EMAS motor protection circuit breakers are used by control-panel builders, machine manufacturers and automation engineers to provide reliable overload, short-circuit and phase-failure protection for industrial motors.
