860-928-6551 Putnam, Connecticut

ZERO SPEED SWITCHES

Stop an entire operation if one machine fails.

RotoGuard® III Speed Switches

Three models to fit your application:

  • Zero Speed – Actuates an alarm when the shaft speed drops below 1 RPM. Not field-adjustable.
  • Adjustable Alarm Speed – Ideal for applications where an alarm is needed with a 15% or greater change in rotational speed.
  • Digital Set Alarm Speed – Easy and precise alarm adjustment with as small as a 3% change in operating speed.

The RotoGuard® III is an electronic speed switch device for sensing the reduction, increase, or loss in rotational motion associated with many types of moving equipment. The unit can detect changes in motion between 1 and 400 RPM, depending on the model selected, and provide a change of state, or alarm, when a variation in operating speed occurs. The RotoGuard® III may be direct coupled to another shaft or driven with a belt or chain.

The RotoGuard® III is designed with an optical encoder and multi-toothed interrupter wheel to transform the rotation of the input shaft to voltage pulses. A change of input speed from the calibrated normal speed results in the output relay changing state. All models provide a startup alarm delay feature which allows time for the monitored equipment to come up to speed before the unit will alarm.

Features:

  • Low cost solid state electronics
  • Adjustable startup alarm delay (0-60 seconds)
  • Models available with NEMA 4/5 Rating (weatherproof and dust tight) or NEMA 7/9 Rating (Explosion Proof [EP models cannot exceed 100 RPM.])
  • All models are UL Listed

Dazic® Application

Data Sheet

ROTOGUARD® III
Temperature Range -40° to +160° F

(-40° to +71° C)
Input Shaft Speed 1-300 RPM (Zero & Adjustable Speed models)

1-400 RPM (Digital models)
Input Voltage 120 VAC or 240 VAC at 50/60 Hz (Factory Set)
Output Relay – 5 Amp, DPDT (Double Pole, Double Throw)
Power Consumption 3 Watt
Weight 7 lbs. (3.2 kg)

Zero Speed

Model Number Input Voltage Mounting Frame
NEMA 4/5 — Weatherproof and dust tight

SA3A1Z1

120 VAC

No

SA3B1Z1

120 VAC

Yes

SA3B2Z1

240 VAC

Yes

NEMA 7/9 — Explosion Proof*

SX3A1Z1

120 VAC

No

SX3B1Z1

120 VAC

Yes

SX3B2Z1

240 VAC

Yes

Adjustable Alarm Speed

Model Number Input Voltage Mounting Frame
NEMA 4/5 — Weatherproof and dust tight

SA3A1A1

120 VAC

No

SA3A2A1

240 VAC

No

SA3B1A1

120 VAC

Yes

SA3B2A1

240 VAC

Yes

NEMA 7/9 — Explosion Proof*

SX3A1A1

120 VAC

No

SX3A2A1

240 VAC

No

SX3B1A1

120 VAC

Yes

SX3B2A1

240 VAC

Yes

Digital Set Alarm Speed

Model Number Input Voltage Mounting Frame
NEMA 4/5 — Weatherproof and dust tight

SA3A1D1

120 VAC

No

SA3A2D1

240 VAC

No

SA3B1D1

120 VAC

Yes

SA3B2D1

240 VAC

Yes

NEMA 7/9 — Explosion Proof*

SX3A1D1

120 VAC

No

SX3A2D1

240 VAC

No

SX3B1D1

120 VAC

Yes

SX3B2D1

240 VAC

Yes

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