Motor Protection For The Smallest Motors, 0.25-0.40A
The EMAS MKS1TM-0.40 is a DIN rail manual motor protection switch (MPCB) for the smallest motors, drawing between 0.25A and 0.40A at full load, such as instrument fans, small dosing pumps and synchronous drives. It combines adjustable thermal overload, fixed magnetic short-circuit and phase-loss protection in one compact device, and doubles as the motor's local isolator.
MPN MKS1TM-0.40
- Adjustable thermal overload - set the dial to the motor's nameplate current anywhere from 0.25A to 0.40A
- Fixed magnetic short-circuit trip - 6kA breaking capacity
- Phase deficiency protection - trips if a 3-phase motor loses a phase
- Ambient temperature compensated - the trip point stays consistent as panel temperature changes
Downloads: EMAS MKS1TM-0.40 datasheet (PDF)
Technical Details
Frequently Asked Questions
How is this different from a normal MCB?
An MCB protects the cable with a fixed trip curve. The MKS1TM-0.40 protects the motor itself: its thermal trip is set to the motor's running current, it rides through starting inrush, and it adds phase-loss protection that an MCB does not have.
How do I choose and set the right range?
Read the full load current from the motor nameplate. If it falls between 0.25A and 0.40A, this is the right switch; set the dial to that value. Slightly larger motors need the MKS1TM-0.63 (0.40-0.63A).
Can it be mounted outside a panel?
No. The switch is rated IP40, so it should be fitted on 35mm DIN rail inside an enclosure.
What cable sizes does it accept?
The terminals take 0.75mm² to 4mm² conductors, tightened to 1.8Nm.
Industry Applications
- Instrument and cooling fans - overload and phase-loss protection for very low-current motors
- Dosing and sampling pumps - a combined isolator and motor protector in a single DIN rail module
- OEM machines - compact protection for small auxiliary drives in machine panels
Need a different range? See the EMAS MKS1TM-0.63 (0.40-0.63A) or the EMAS MKS1TM-1 (0.63-1.00A).