The MKS1TM-4 belongs to the MKS1 series of motor protection circuit breakers designed to safeguard three-phase motor windings against short circuits, overload, and single-phase loss. Its thermal current is field-adjustable from 2.5A to 4.0A to match the motor's rated current.

With IP40 protection, a 690V AC insulation voltage, and a short-circuit breaking capacity of 6kA, it meets industrial installation requirements. The device accepts cable cross-sections from 0.75 to 4mm² and operates across a -5 to +40°C temperature range.

Key Features

• Thermal current adjustment range: 2.50–4.00A
• Short-circuit breaking capacity: 6kA
• Insulation voltage: 690V AC
• Impact withstand voltage: 6kV
• Protection class: IP40
• Three-phase motor protection: short circuit, overload, and phase-loss detection

Product Benefits

• Field-adjustable thermal setting from 2.50 to 4.00A matches the connected motor precisely
• 6kA breaking capacity handles short-circuit faults in industrial panel environments
• 690V AC insulation voltage suits three-phase industrial supply systems
• Operating temperature -5 to +40°C covers standard indoor switchgear cabinet conditions
• Mechanical and electrical life of 100,000 operations each ensures long service life in demanding duty cycles

Technical Specifications

• Model: MKS1TM-4
• Product Type: Motor Protection Switch
• Thermal Current Adjustment Range: 2.50–4.00A
• Contact Current: 25A
• Operating Frequency: 50–60Hz
• Usage Category: AC 3
• Insulation Voltage: 690V AC
• Impact Withstand Voltage: 6kV
• Dielectric Strength (Contact-Contact): 1890V
• Insulation Resistance: 10MΩ min. (500V DC)
• Short-Circuit Breaking Capacity: 6kA
• Mechanical Life: 100,000 operations (min.)
• Electrical Life: 100,000 operations (min.)
• Working Frequency: Mech. 360 / Elect. 360 on/off per hour
• Operating Temperature: -5 to +40°C
• Protection Class: IP40
• Cable Cross Section: 0.75–4mm²
• Clamping Force: 1.8Nm

Why You'll Love It

• Adjustable thermal range means a single switch model covers multiple motor sizes in the 2.5–4A band
• IP40 rating keeps out solid particles in standard electrical enclosures
• 1890V dielectric strength provides reliable insulation between contacts
• Package includes 1× MKS1TM-4 thermomagnetic motor protection switch