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

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

The SCHNEIDER Overload Relay: Thermal Protection (MPN LR3D21L) is a 3-pole IEC thermal overload relay designed for use with TeSys Deca contactors (18 to 38 Amp models). It features integrated bimetallic elements…

SKU 3G-OTH-40551

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

SCHNEIDER
Manufacturer Part Number
LR3D21L
Type
1NO/1NC, TeSys Deca (18 to 38 Amp Models)
Poles
3
Compatible Contactors
TeSys Deca (18 to 38 Amp Models)
Auxiliary Contact Form
1NO/1NC
Maximum Voltage Rating
690V AC
Phase Loss Sensitivity
No
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 Overload Relay: Thermal Protection (MPN LR3D21L) is a 3-pole IEC thermal overload relay designed for use with TeSys Deca contactors (18 to 38 Amp models). It features integrated bimetallic elements, eliminating the need for separate thermal units, and provides 1NO/1NC auxiliary contacts with screw clamp terminals. The relay has a maximum voltage rating of 690V AC and does not include phase loss sensitivity.

Frequently Asked Questions

What is the SCHNEIDER LR3D21L overload relay used for?

The SCHNEIDER LR3D21L is a 3-pole IEC thermal overload relay that protects motors from overheating due to sustained overcurrent. It is designed for use with TeSys Deca contactors (18 to 38 Amp models) in industrial motor control applications, providing reliable thermal protection via integrated bimetallic elements.

What are the specifications of the SCHNEIDER LR3D21L overload relay?

The SCHNEIDER LR3D21L is a 3-pole thermal overload relay with 1NO/1NC auxiliary contacts, screw clamp terminals, and a maximum voltage rating of 690V AC. It includes integrated bimetallic elements, so no separate thermal units are required. It does not offer phase loss sensitivity and is compatible with TeSys Deca contactors (18 to 38 Amp models).

Where to buy the SCHNEIDER LR3D21L overload relay worldwide?

You can source the SCHNEIDER LR3D21L 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; we supply genuine SCHNEIDER components for industrial motor protection 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 amp range to the motor full-load current and ensure compatibility with the contactor series. The LR3D21L is designed for TeSys Deca contactors (18 to 38 Amp models). Verify the auxiliary contact configuration (1NO/1NC) and voltage rating (690V AC) meet your circuit requirements.

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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