Reliable Zero Speed Switch Manufacturers for Industrial Applications

Zero Speed Switch / Electronic Speed Switch / Monitor / Indicator

Application :

Electronic Speed Monitor is used to monitor speed of conveyors, crushers, rolling mills, agitators, mixers, stirrers, screw conveyors, and other industrial machinery. This device actuates relay contacts at preset speed. Using these contacts desired control action such as reliable zero speed protection / under speed protection/ over speed protection can be achieved.

Advantages :


Output :

Initial Time Delay & Nuisance Delay :

Enclosure :

Common Specification :

Sensor Probe

Totally enclosed, Inductive Type

Enclosure : Ni – Cr plated Brass enclosure, M 30 size with two check nuts (Refer group 4 of ordering proforma for other options)

Control Unit :

  • Enclosure : Field mounting IP65, Cast AL/Din Rail IP30 / Flame Proof (Refer group 2 of ordering proforma)
  • Output : 2 C/O relay contact, Rating 5Amp resistive at 230V AC with Led indication for supply ON, Sensor ON and Relay ON

Electronic Speed Switch / Zero Under Speed Switch :

Series ESW

The model is provided with the potentiometric setting. Suitable speed range is to be selected from six optional speed ranges 1 – 10, 10 – 100. 5 – 50, 50 – 500, 100 – 1000 and 500 – 5000 RPM. It also has a special optional facility to multiply speed range X 10 & X 100. Easy speed setting by the potentiometer, with supply ON ‘Relay ON’ and ‘SENSOR LED’ indication.


  • Speed Switch : Din Rail mounting, IP 30 panel mounting enclosure, potentiometric setting, type ESW – D.
  • Speed Switch : Weatherproof, field mounting, IP65 enclosure, potentiometric setting, type ESW – F.
  • Speed Switch : Weatherproof, field mounting IP65 enclosure, DMC Enclosure potentiometric setting, type ESW – M.
  • Speed Switch : Flame – proof enclosure for use in hazardous area with intrinsically safe sensor and control circuit, type ESW – L.

Manufacturers, Suppliers, Exporters & Distributors of Reliable Zero Speed Switch in India

The Zero Speed Switch is a self-contained device that detects and sends output alarms for machinery operating at low or no speed, as well as early jamming detection. Early detection of the under-speed condition is beneficial in reducing downtime caused by jamming or transmission failure, particularly in the case of medium and large motors.

Micro Controller Based, Speed Indicator Monitor – Tachometer Series ESW M


Micro Controller based circuitry packed with customer friendly features.

  • Selectable number of flags. Enter number of flags which are available at site, Speed Monitor will get automatically calibrated for these flags
  • Digital Display
  • Adjustable trip delay
  • Settable hysteresis
  • Special models for combined under over speed monitoring duty
  • Special models with RS 232 / RS 485 retransmission facility

Digital Tachometer Series : ESW – D

It receives input from Transducer ( like proximity switch ) or analog input ( from transmitter ) and indicate speed in RPM, MPM or any other unit. Rotational/linear speed indication is possible. The unit is enclosed in panel mounting ( cutout 92 X 92 ) or dust proof, field mounting or flame proof enclosure.

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Frequently asked questions

1] What is the use of Zero speed switch?

Ans: Zero speed switch is used to detect the speed of driven part ( Tail side of Pulley )of the system has become zero or lower than the set speed to stop the driver ( Motor ).

2] What is working principle of Zero speed switch?

Ans: ZSS consist of 2 part , sensor probe and control unit. The metal piece/ flag is fixed with the rotating shaft in such a way that it rotates in front of the sensor probe. These pulses generated are fed to control unit where they are compared with set rpm (set pulses ), If pulses fed by sensor probe is below set PPR or RPM then the output of control unit changes. Usually, the output is potential-free relay contact. This relay contact is further used to trip the motor or for corrective action.

3] What is zero speed switch and how to use a zero speed switch?

Ans: Zero speed switch is a combination of a sensor probe and a control unit. sensor probe detects the motion of the shaft connected to the motor and fed to the control unit. The control unit compares the frequency of fuse with set frequency (RPM). If it is lower than the set rpm control unit changes relay status and this relay is further used to control the motor on-off signal.

Zero Speed Switch Manufacturers, Suppliers, Exporters & Distributors in India

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