Frequently Asked Questions

What is the normal operating temperature for the thermostat?


Varies from Thermostat to Thermostat but from –5°C to 150°C

What is the tolerance of a thermostat?

This refers to how closely the switch snaps on or off to the required operating temperature. In most cases this is + or – 3°C on opening temperature and + or – 4°C on closing temperature. That is, if you request a switch to cut out at 90°C, then the tolerance of + or – 3°C means it can operate anywhere from 87°C to 93°C

What is the differential of the thermostat?

The differential is factory set between 8°C and 10°C. This means that if the operating temperature is 90°C, then the ambient temperature around the device must fall between 8°C and 10°C before it starts operating again.

What options do we have with terminals?

In most cases we offer the following alternatives

  • 6.3mm quick connect
  • 5/32 inc screws of solid brass
  • Solder terminals
  • Flying leads

What does Normally Open and Normally closed mean?

 


Normally closed contacts means that the thermostat will keep the current on until the predetermined temperature is reached and then the thermostat will trip and switch the device off. By contrast normally open means that the thermostat will keep current off until the predetermined temperature is reached and then the thermostat will trip and switch the device on.

What is the difference between closed face and open face?
Closed face thermostats are those where the aluminum cap housing on the front (or top) of the thermostat completely covers the bi-metal disc beneath.  Open-faced thermostats are those where the aluminum cap housing on the front (or top) of the thermostat partially exposes the bi-metal disc beneath.

What fixing options are available for the T3 thermostat?


Flat surface, ½” copper, 5/8” copper, ¾” copper & 5/16” copper

Is the overload automatic or manual?

 


The easiest way to tell is by looking at the top of the overload and checking if there is a red button or not. The red button usually denotes that the overload is manual.

What is trip time?

Trip time refers to the length of time between the motor reaching locked rotor status and the time the overload is set to interrupt the power supply. Usually somewhere between 5 and 20 seconds.

How do overload switches provide dual protection of motors and devices?


Overload switches are designed to provide protection from excessive temperatures within the motor housing or windings whilst at the same time disconnecting the power supply in locked rotor conditions.

What is locked rotor status?

Locked rotor occurs when the rotor of a motor stops turning. This can be caused by many issues including; blockages in supply lines, rusted or malfunctioning bearings, and or a range of other issues. When locked rotor occurs overloads are set to interrupt the power supply after a set amount of time has elapsed.

What terminal options are available?
Solder lugs, quick connect, spade terminals or fly leads

What optional extras are available with Overloads?

Both standard and extended push buttons are available on manual versions

A Neoprene dust cover is available for manual versions

A Bakelite dust cover is available for automatic versions.

FleetTek Engineering Solutions Pty Ltd - Unit 9/10 Bradford Street, ALEXANDRIA NSW 2015 derwent@fleettek.com.au Ph: 61 2 9693 2666; Fax: 61 2 9693 2662

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