LR2K Series Thermal Overload Protection Relay LR2K0301-0312
LR2K Series Thermal Overload Protection Relay LR2K0301-0312
LR2K Series Thermal Overload Protection Relay LR2K0301-0312
LR2K Series Thermal Overload Protection Relay LR2K0301-0312
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LR2K Series Thermal Overload Protection Relay LR2K0301-0312
LR2K Series Thermal Overload Protection Relay LR2K0301-0312
LR2K Series Thermal Overload Protection Relay LR2K0301-0312
LR2K Series Thermal Overload Protection Relay LR2K0301-0312
3UA Series Motor Protection Thermal Overload Relay
3UA Series Motor Protection Thermal Overload Relay
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Replacement Contactor Coils for 3RT10 Series
Replacement Contactor Coils for 3RT10 Series

LR2K Series Thermal Overload Protection Relay LR2K0301-0312

Brand Name:Newtrend or OEM
Theory:Thermal Relay
Place of Origin:China
application:PROTECTIVE
Model Number:LR2K
Contact Load:High Power
Protect Feature:Sealed
SKU: 1770407659166507008 Category:
Description

LR2-K LR2K0301 LR2K0302 LR2K0303 LR2K0304 LR2K0305 LR2K0306 LR2K0307 LR2K0308 LR2K0310 LR2K0312 LR2K Thermal Overload Relay

   

LR2K – Thermal overload relays

 

LR2K is a reliable series of thermal overload relays designed to cover the range of motor ratings up to 16 A. The devices can be combined with TeSys K contactors in a 45 mm wide space to form an extremely compact starter.

  • Manual or automatic reset
  • Sealable flap
  • Prewiring kit available
  • Terminal block for separate mounting
  • Remote electrical reset
  • Connector options:
  • Spring terminal
  • Screw clamp
  • Class 10 A

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for LR2K Series Thermal Overload Protection Relay LR2K0301-0312.

📥
Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.
Request Official Datasheet (PDF)
📐
2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.
Request CAD Model
Certified Standards: IEC 60898-1, IEC 60947-2, CE, RoHS, ISO 9001:2015
Manufacturer: Shanghai Newtrend Electric Co., Ltd. (Global Export Compliance)
Engineering Support: 24-hour response for custom voltage ratings, auxiliary contacts, and technical consulting.
Technical FAQ & Selection Guide

💡 Frequently Asked Technical Questions & Selection Guide

Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.

AC-1 / AC-3 Duty

How to calculate contactor rating based on motor power and utilization categories (AC-1 vs AC-3 vs AC-4)?

A

AC-3 rating applies to standard squirrel-cage motor starting and stopping during normal run (starting current 5–7x In). For non-inductive or purely resistive heating loads, use the higher AC-1 rating. For severe inching, jogging, and plugging applications (AC-4 duty), derate the contactor or upsize by 1 to 2 frame sizes to prevent contact erosion.

Coil Voltage Selection

How to choose the correct control coil voltage, frequency, and electronic wide-voltage options?

A

Standard AC coils include 24V, 48V, 110V, 220V/230V, 380V at 50/60Hz. For DC control loops or PLC outputs, specify DC coils or electronic wide-range AC/DC coils (e.g. 100V–250V AC/DC) which feature built-in surge suppression, low holding power consumption, and immunity to voltage dips.

Overload Coordination

How to size and coordinate the matching thermal overload relay (TOR) for Type 2 protection?

A

Select a thermal overload relay whose current setting range straddles the motor full-load current (FLA). Set the dial precisely to 1.0x motor nameplate FLA. For IEC 60947-4-1 Type 2 coordination, pair the contactor and relay with backed-up upstream fuses or fast-acting MCB/MCCB to prevent welding under fault conditions.

Auxiliary & Interlocks

What auxiliary contact blocks and mechanical interlocks can be added for motor reversing?

A

Units feature built-in 1NO or 1NC auxiliary contacts, expandable with top-mounted 2-pole or 4-pole auxiliary contact blocks (F4 / AX) and pneumatic timer delay blocks. For forward/reverse motor starters or star-delta starter assemblies, add side-mounted mechanical interlock units (MI) with electrical interlocking.

Ambient & Altitude Derating

How do ambient temperature and installation altitude affect contactor performance?

A

Standard ratings are calibrated for -5°C to +40°C. For ambient temperatures exceeding 55°C or altitudes above 2000m (where reduced air density diminishes heat dissipation and dielectric insulation), derate operational current by 2% per 100m above 2000m and verify insulation voltage limits per IEC standards.

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