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Square D

A1.54 - Thermal Unit, Type S, Type A, melting alloy, Class 20

Category Thermal Overload Heater Elements
Picture of A1.54 - Thermal Unit, Type S, Type A, melting alloy, Class 20
Square D

A1.54 - Thermal Unit, Type S, Type A, melting alloy, Class 20

Item Code: 17815
Category Thermal Overload Heater Elements
Manufacturer SCHNEIDER ELECTRIC
Manufacturer Ref A1.54

Full Engineering Drawing
Specification Sheet
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Description

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.

Specifications

Weight

0.04

Width

1.19

Length

2.48

Brand

Square D

Category

THERMAL OVERLOAD HEATER ELEMENTS

Material

Melting Alloy

Mounting Type

Plug-In

Series

A Series

Temperature Trip Range

40 deg C

Trip Type

Standard

Type

Class 20

Square D

A1.54 - Thermal Unit, Type S, Type A, melting alloy, Class 20

Category Thermal Overload Heater Elements
Picture of A1.54 - Thermal Unit, Type S, Type A, melting alloy, Class 20
Square D

A1.54 - Thermal Unit, Type S, Type A, melting alloy, Class 20

Item Code: 17815
Category Thermal Overload Heater Elements
Manufacturer SCHNEIDER ELECTRIC
Manufacturer Ref A1.54

Full Engineering Drawing
Specification Sheet
Watch video
Call for Availability
Add to Favorites
Compare

Description

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.

Specifications

Weight

0.04

Width

1.19

Length

2.48

Brand

Square D

Category

THERMAL OVERLOAD HEATER ELEMENTS

Material

Melting Alloy

Mounting Type

Plug-In

Series

A Series

Temperature Trip Range

40 deg C

Trip Type

Standard

Type

Class 20

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