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Schneider Electric LRD21 overload relay, three-pole, 12 to 18 amps, class 10

Schneider Electric

Schneider Electric LRD21 Overload Relay 12 to 18A 3P Class 10

SKU CH-758R-H858W

Protects LC1D18 to LC1D32 contactors with a 12 to 18A three-pole Class 10 manual-reset overload relay

  • Type3" Harsh Environment, Hook-and-Loop Closure
  • Protects motors with 12.0 to 18.0A trip range
  • Matches LC1D18 to LC1D32 contactors for direct fit
  • Class 10 trip responds quickly to overloads
  • Manual reset gives operator full restart control
  • Three-pole design covers all phases in one unit

Schneider Electric LRD21 Overload Relay

The Schneider Electric LRD21 is a thermal overload relay rated for a current range of 12.0 to 18.0 amperes. It features three poles and a Class 10 trip characteristic. The relay is designed for use with LC1D18 to LC1D32 series contactors and starters. Manual reset operation is provided after a trip event.

Suited for motor protection panels

This relay suits installers fitting motor protection to existing LC1D18 through LC1D32 contactors where a 12 to 18 ampere setting range is required. It is not for applications needing a different current range or an automatic reset function. Builders using contactor series outside the LC1D18 to LC1D32 range should look at other relays.

Class 10 trip characteristic

The single specification that decides fit is the Class 10 trip characteristic combined with the 12.0 to 18.0 ampere range. This defines the thermal response curve for standard motor starting duties. Verify the contactor model matches the LC1D18 to LC1D32 series before ordering.

Highlights

  • Protects motors with 12.0 to 18.0A trip range
  • Matches LC1D18 to LC1D32 contactors for direct fit
  • Class 10 trip responds quickly to overloads
  • Manual reset gives operator full restart control
  • Three-pole design covers all phases in one unit

Specifications

BrandSchneider Electric
ModelLRD21
Type3" Harsh Environment, Hook-and-Loop Closure

Questions about this item

What is the maximum continuous current the LRD21 can carry before its Class 10 trip activates?

The relay is calibrated for a 12.0 to 18.0 A operating range and will trip on sustained overloads according to Class 10 timing.

Does the relay generate audible noise or measurable heat during all-day operation?

As an electromechanical thermal device it runs silently; warmth is normal and stays within the limits defined by the 690 V insulation rating.

Which contactors must already be installed for the LRD21 to mount and function correctly?

It is designed to fit directly on Schneider Electric LC1D18 through LC1D32 series contactors.

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