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Picture of Thermal Unit, Type S, Type A, melting alloy, Class 20
SKU:

A.86

Thermal Unit, Type S, Type A, melting alloy, Class 20

Old price: $32.56 INC GST
$20.51 INC GST
Available for Shipping : 19-Aug-2025
Thermal Unit, Type S, Type A, melting alloy, Class 20
  • Switch electric motors with variety of overload relays
  • Available in NEMA Sizes 00-7
  • 600V maximum
  • Thermal units available in standard, quick, and slow trip
  • Simple catalog number for easy and fast ordering
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Manufacturer: Square D
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Product Data Sheet
Thermal units are intended to protect motors, controllers, and branch circuit conductors against excessive heating due to prolonged motor over currents up to and including locked rotor currents. Protection of the motor and the other branch circuit components from higher currents, due to short circuits or grounds, is a function of the branch circuit fuses or circuit breakers. Class 20 thermal units respond to overload current conditions according to trip curves. These thermal units will trip in 20 seconds or less on overload conditions. The proper thermal unit is selected using the motor full load current and a selection table. These thermal units have a one piece construction. The motor current passes through a small heater winding within these thermal units. Under overload conditions, the heat causes a special solder to melt allowing a ratchet wheel to spin free thus opening the control circuit contacts and opening the motor contacts.

Products specifications

Attribute name Attribute value
Main
Motor tripping class 20
Range of product A
Thermal overload type melting alloy
Packing Units
Unit Type of Package 1 1
Number of Units in Package 1 1
Package 1 Height 2.032 cm
Package 1 Width 3.048 cm
Package 1 Length 6.096 cm
Package 1 Weight 18.144 g
Unit Type of Package 2 2
Number of Units in Package 2 6
Package 2 Height 8.890 cm
Package 2 Width 4.318 cm
Package 2 Length 6.604 cm
Package 2 Weight 99.790 g

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