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SCHNEIDER Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC, Phase Loss Sensitivity - IEC Thermal Overload Relays
SCHNEIDERIEC Thermal Overload Relays

SCHNEIDER Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC, Phase Loss Sensitivity

The SCHNEIDER LRD21L is an IEC thermal overload relay with integrated bimetallic elements, rated for 12 A to 18 A and a maximum voltage of 690V AC. It features 1NO/1NC auxiliary contacts, screw clamp terminals, and…

SKU 3G-OTH-40578

Brand
SCHNEIDER
Item
Overload Relay: Thermal Protection, 3 Poles, 1NO/1NC, Phase Loss Sensitivity
Category
IEC Thermal Overload Relays
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Technical Specifications

SCHNEIDER
Manufacturer Part Number
LRD21L
Type
1NO/1NC, Phase Loss Sensitivity, 12 A – 18 A
Poles
3
Compatible Contactors
TeSys Deca (18 to 38 Amp Models)
Auxiliary Contact Form
1NO/1NC
Maximum Voltage Rating
690V AC
Phase Loss Sensitivity
Yes
Thermal Units Required
None (Relay Includes Integrated Bimetallic Elements)
Terminal Connection Type
Screw Clamp Terminals
Compatible Contactor Series
TeSys Deca
View Full Spec Sheet

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SCHNEIDER Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SCHNEIDER LRD21L is an IEC thermal overload relay with integrated bimetallic elements, rated for 12 A to 18 A and a maximum voltage of 690V AC. It features 1NO/1NC auxiliary contacts, screw clamp terminals, and phase loss sensitivity. This relay is compatible with TeSys Deca contactors (18 to 38 Amp models) and requires no external thermal units.

Frequently Asked Questions

What is the SCHNEIDER LRD21L overload relay used for?

The SCHNEIDER LRD21L is an IEC thermal overload relay that protects motors from overheating and phase loss. It is used in industrial motor control panels, conveyors, pumps, and compressors. The relay integrates bimetallic elements and is compatible with TeSys Deca contactors (18 to 38 Amp models).

What are the specifications of the SCHNEIDER LRD21L overload relay?

The SCHNEIDER LRD21L is a 3-pole thermal overload relay rated for 12 A to 18 A with a maximum voltage of 690V AC. It features 1NO/1NC auxiliary contacts, screw clamp terminals, and phase loss sensitivity. No external thermal units are required as it includes integrated bimetallic elements. It is compatible with TeSys Deca contactors.

Where to buy the SCHNEIDER LRD21L overload relay worldwide?

You can source the SCHNEIDER LRD21L overload relay through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time. 3G Electric supplies genuine SCHNEIDER components for industrial applications.

How to select the correct SCHNEIDER overload relay for a TeSys Deca contactor?

To select the correct SCHNEIDER overload relay, match the relay's current range (e.g., 12 A – 18 A for LRD21L) to the motor full-load current. Ensure the relay is compatible with your TeSys Deca contactor series (18 to 38 Amp models). The LRD21L includes integrated bimetallic elements and phase loss sensitivity for comprehensive motor protection.

Used in

Common applications for SCHNEIDER
Motor starting in conveyor systems — Schneider Altistart ATS 22 soft starters (e.g., ATS22D17S6U) reduce inrush current.
Speed control for industrial pumps — Schneider Altivar ATV320 VFDs (e.g., ATV320U55N4W) provide variable flow regulation.
Machine safety interlocking — Schneider XPSUAF13AP safety relays monitor emergency stop circuits on assembly lines.
Panel-mounted control stations — Schneider XB5 flush push buttons (ZB5AA5) serve as start/stop operators in MCCs.
Heavy-duty motor switching — Schneider LC1G150LSEA contactors handle 150 A loads in compressor and crusher applications.
Emergency stop actuation — Schneider 9001K mushroom-head push buttons (9001KR25R) provide red, momentary stop functions.

SCHNEIDER Products

3G Electric supplies SCHNEIDER iec thermal overload relays. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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