TMSTA440 - TIME RELAY S/D 380/440V 50/60

Why Choose the TMSTA440?

The Lovato TMSTA440 is a TMST series star–delta time relay engineered for dependable motor starting. This modular unit mounts on DIN rail and is suited to 380–440 VAC systems. Setup is quick via front potentiometers, offering multiscale timing to match your sequence. With 8 A Ith and 4 kV impulse withstand, the TMSTA440 delivers robust control performance for panel builders and maintenance teams seeking reliable, consistent transitions.

Built for longevity and stability, the TMSTA440 achieves 30000000 mechanical cycles and operates from -20 to +60 °C, with storage from -30 to +80 °C. Weighing just 90 g, it helps keep panels compact while meeting IEC/EN 61812-1, UL508 and CSA C22.2 n°14. Use it to orchestrate dependable star–delta switching and simplify commissioning with clear, accessible adjustments.

Key Benefits

• Star–delta function simplifies reliable motor starting transitions.
• Modular DIN rail mounting speeds integration in control panels.
• Multiscale timing via front potentiometers for flexible setup.
• 8 A Ith handles demanding control circuits with confidence.
• 4 kV impulse withstand helps protect against transient surges.
• Operates reliably from -20 to +60 °C ambient temperatures.
• Long 30000000-cycle mechanical life reduces maintenance interventions.
• Conforms to IEC/EN 61812-1, UL508 and CSA C22.2 n°14.

Technical Specification

• Product type designation: TMST
• Ith (IEC): 8 A
• Rated impulse withstand voltage Uimp: 4 kV
• Mechanical life: 30000000 cycles
• Operating temperature: -20 to +60 °C
• Storage temperature: -30 to +80 °C
• Weight: 90 g

What’s Included

• Lovato TMSTA440 TMST series time relay unit
• Quick start and installation leaflet
• Compliance and safety information
• Protective packaging

Applications

• Star–delta motor starting sequences in industrial control panels
• Pumps, fans and compressors using 380–440 VAC supplies
• Conveyor and materials handling start-up timing
• HVAC plant and building services control panels
• Process automation requiring timed star-to-delta transitions

Safety note: Installation must be performed by qualified personnel. Isolate the 380–440 VAC supply before wiring, observe the stated temperature limits, and follow IEC/EN 61812-1 and manufacturer guidance.