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Bolec BMT-55 mechanical timers

Turn the dial. Set the time. Walk away.

Simple mechanical run-down timers for irrigation pumps, valves, control panels and industrial machinery.

  • No battery required
  • No programming required
  • Works without external power
  • Automatic return to zero
Compare the 3 timers Buy 12-hour model
Bolec BMT-55 12-hour mechanical timer
Mechanical operation No electronic programming required.
Power independent The timer mechanism runs without external power.
Automatic shut-off Returns to zero at the end of the selected period.
Three time ranges Choose 4 hours, 120 minutes or 12 hours.
BMT-55 12-hour mechanical timer as an alternative to ISGUS ISG12 and MO12
ISGUS replacement option

Looking for an ISGUS ISG12 / MO12 / KS55 alternative?

The BMT-55 is a dependable 12-hour wind-up mechanical timer commonly used as an alternative to the ISGUS ISG12 / MO12 / KS55.

Turn the dial to the required time. The timer counts down mechanically, returns to zero and switches at the end of the selected period.

ISGUS ISG12 replacement ISGUS MO12 alternative ISGUS KS55 replacement 12-hour mechanical timer Irrigation pump timer
Buy BMT-55 12-hour timer View specifications
Powerite BCT2S digital countdown timer conversion kit for ISGUS 24-hour mechanical timer replacement
ISGUS 24-hour replacement option

Replacing an ISGUS ISG24?

The 24-hour ISGUS timer is not replaced by another mechanical BMT-55 model. For this application, Bolec recommends the Powerite BCT2S Digital Countdown Timer 240V Conversion Kit.

This conversion kit is designed for customers searching for an ISGUS ISG24 replacement or a practical alternative to an obsolete 24-hour mechanical timer.
View BCT2S conversion kit Ask about ISG24 replacement

Choose the right BMT-55 timer

Select the time range and switch configuration that best matches your application.

BMT-55-4H four-hour mechanical timer
0–4 hours

BMT-55-4H

For short-duration irrigation and valve control.

  • Short irrigation cycles
  • Solenoid valves
  • Landscaping and garden watering
  • DPDT switch configuration
View 4-hour timer
BMT-55 120-minute mechanical timer
0–120 minutes

BMT-55 120mins

For general timed control and shorter machine cycles.

  • Pumps and short override periods
  • Ventilation systems
  • Heaters and ovens
  • DPDT switch configuration
View 120-minute timer
Best seller
BMT-55-12H twelve-hour mechanical timer
0–12 hours

BMT-55-12H

For long irrigation cycles, pumps and water management.

  • Long-duration irrigation
  • Greenhouses and bore pumps
  • Pumps, valves and control panels
  • DPST switch configuration
Buy 12-hour timer

Compare the full BMT-55 range

See the three available time ranges, switch configurations and common applications at a glance.

BMT-55 mechanical timer range comparison chart

Three timers, one simple operating principle

All BMT-55 models use a clear mechanical dial and automatic return-to-zero operation. The main differences are the time range and switch configuration.

  • 4-hour: short irrigation and valve cycles
  • 120-minute: general timed control and short machine cycles
  • 12-hour: long irrigation and pump operation
View full specification sheet

Common applications

A practical timing solution for sites where simplicity and reliability matter.

Irrigation Pumps, bore systems, valves and farm water control.
Control panels Simple manual timing and override operation.
Industrial automation Timed machine and ventilation operation.
Cable machinery Vulcanising equipment and timed heating cycles.
BMT-55 mechanical timer side view BMT-55 mechanical timer mounted in weatherproof enclosure
Weatherproof enclosure option

Need the timer supplied in an enclosure?

The BMT-55 can be supplied mounted in a weatherproof enclosure for easier field installation. In principle, any BMT-55 time range can be mounted in the enclosure.

  • Suitable for outdoor installations
  • Pre-mounted timer option
  • 4-hour, 120-minute or 12-hour timer
  • Contact us for the required configuration
Buy enclosed 12-hour model Ask about another timer range

Simple mechanical timing that is easy to trust

Turn the dial to the required run time. The timer counts down mechanically and returns to zero automatically at the end of the selected period.

No programming No battery Clear physical dial Automatic return to zero
Check before replacing another timer

BMT-55-12H uses DPST. The 4-hour and 120-minute models use DPDT. Confirm the time range and contact arrangement before ordering.

Wiring diagram View contact arrangement → Specification sheet View ratings and dimensions → Need help choosing? Ask Bolec Electronics →

Ready to choose your timer?

Select the required time range or contact us for wiring compatibility.

Buy BMT-55-12H Contact sales
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