Square D LRD TeSys Deca Class 20 Thermal Overload Relay

Square D LRD TeSys Deca Class 20 Thermal Overload Relay

The Square D TeSys Deca (LRD) thermal overload relay family delivers reliable motor protection for use with compatible TeSys D contactors such as LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, and LC1D38. This relay line is available in Motor FLA (full load amp) ratings from 2.5A to 13A across four adjustment ranges — 2.5...4A, 4...6A, 5.5...8A, and 9...13A — allowing precise sizing to the connected motor. Built to a Class 20 tripping profile per IEC 60947-4-1, every relay in the TeSys Deca line shares thermal overload protection, phase unbalance sensitivity, an IP20 degree of protection, and a rated operational voltage (Ue) of 690V AC over a 0...400 Hz range, making it a dependable choice for industrial and commercial motor control circuits.

Key Features

• Motor FLA Range: Select from 2.5...4A, 4...6A, 5.5...8A, or 9...13A adjustment bands to match the protected motor's full load current.
• Tripping Class: Class 20 thermal overload tripping conforming to IEC 60947-4-1 for standard motor starting duty.
• Rated Voltage: Ue 690V AC (0...400 Hz) power circuit; Ui rated insulation voltage of 600V CSA, 600V UL, and 690V per IEC 60947-4-1.
• Degree of Protection: IP20 conforming to IEC 60529 for protection against solid foreign objects and finger contact.
• Manual Control: Integrated red push-button stop and blue push-button reset for fast, tool-free operator control.
• Contactor Compatibility: Designed to mount with TeSys D contactors including LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, and LC1D38.
• Network Type: Suitable for both AC and DC network applications.
• Mounting Support: Mounts under the contactor, or on a plate or rail with specific accessories.
• Tripping Threshold: 1.14 +/- 0.06 Ir per IEC 60947-4-1, with phase failure sensitivity tripping at 130% of Ir when one phase drops to 0.

Certifications & Compliance

• UL Listed and CSA Certified
• IEC 60947-4-1 and EN/IEC 60947-4-1 compliant
• UL 60947-5-1 and EN/IEC 60947-5-1 compliant
• CSA C22.2 No 60947-4-1 and No 60947-5-1
• ATEX INERIS, EAC, ABS, and UKCA certified
• EN 50495 compliant

Technical Specifications

• Voltage Rating: 690V
• Toxic Heavy Metal Free: Yes
• Warranty: 18 months
• Mercury Free: Yes
• Sustainable Packaging: Yes
• Compatibility Code: LRD
• Country of Origin: Thailand
• Climatic Withstand: IACS E10

Typical Applications

• Motor Overload Protection for TeSys D Contactors
• Industrial Motor Control Panels and Motor Control Centers
• Commercial and Industrial Electrical Installations
• Control Circuit and Panelboard Wiring
• New Construction and Motor Control Retrofits

Why Square D?

Square D's TeSys Deca relays are engineered to recognized IEC, UL, and CSA standards, giving electrical professionals a thermal overload solution built for consistent, code-compliant motor protection across a full range of Motor FLA ratings. With sustainable packaging, a mercury-free and toxic heavy metal-free construction, and an 18-month warranty, this TeSys Deca relay family is a dependable addition to any TeSys D-based motor control installation.