Name: LR2-D33 Thermal Overload Relay - Geya Electrical Time Relay
SKU: LR2-D33

Description

Product Overview

The GEYA LR2-D33 Thermal Overload Relay is a high-performance electrical protection device designed for AC motor overload and phase failure protection in 50Hz/60Hz circuits up to 660V. With a broad current setting range from 17A to 93A, this robust thermal relay ensures industrial motor safety, prevents overheating, and complies with IEC60947-4 standards for reliable heavy-duty applications. It acts as a critical fail-safe, extending the lifespan of your valuable machinery.

Key Advantages & Features

The LR2-D33 series is engineered for heavy-duty industrial environments, offering precise current monitoring and rapid circuit interruption during abnormal electrical conditions.

Advanced Temperature Compensation: Automatically adjusts to ambient temperature changes (-5°C to +40°C), ensuring accurate tripping without nuisance interruptions.
Phase Failure Protection: Built-in differential mechanism quickly detects phase loss, cutting power before severe motor winding damage occurs.
Heavy-Duty Terminals: Features M10 terminal screws accommodating 4~35 mm² cross-sectional area conductors, perfect for high-current applications.
Flexible Integration: Can be directly plugged into GLC1-40~95 contactors to save panel space, or mounted independently via DIN rail/screws.

Normal Operating & Installation Conditions

Altitude: Must not exceed 2000m.
Ambient Temperature: -5°C to +40°C. The average temperature within a 24-hour period must not exceed +35°C.
Atmospheric Conditions: Relative humidity should not exceed 50% at +40°C. Higher relative humidity is acceptable at lower temperatures (e.g., 90% at +25°C).
Mounting Inclination: The inclination of the mounting surface to the vertical must not exceed 5°.
Environment: Pollution class 3. Install in non-explosive media, free from gases or conductive dust that could corrode metals or destroy insulation. Keep away from rain, snow, and significant vibration.

Attachment Description

Parameter

Technical Item	LR2-D33 Parameter
Rated Operation Current A	93A
Rated Insulation Voltage V	690V
Phase Failure Protection	Yes
Manual & Automatic Reset	Yes
Temperature Compensation	Yes
Motion Indication & Test Button	Yes
Mounting Type	Plug-in / Independent type
Auxiliary Contacts	1NO + 1NC
AC-15 Rated Current (220V / 380V)	2.73A / 1.58A
DC-13 Rated Current (220V)	0.2A
Main Circuit Conductor Area	4~35 mm² (Terminal Screws: M10)
Auxiliary Circuit Conductor Area	0.5~2.5 mm² (Terminal Screws: M3.5)

Specification

Model	NO.	Rectification Current Range (A)	Fuse (A)		Matching Contactor Model
Model	NO.	Rectification Current Range (A)	aM	gG	Matching Contactor Model
LR2-D33	3322	17~25	25	50	GLC1-40~95
	3353	23~32	40	63
	3355	30~40	40	100
	3357	37~50	63	100
	3359	48~65	63	100
	3361	55~70	80	125
	3363	63~80	80	125
	3365	80~93	100	160

Motion Characteristics

Action Time When Three-Phase Load is Balanced
No.	Rectification Current Multiplier	Motion Time	Starting Condition	Environmental Temp
1	1.05	> 2h	Cold state	20 ± 5°C
2	1.2	< 2h	Hot state (after test of No. 1)
3	1.5	< 4min	Hot state (after test of No. 1)
4	7.2	10A: 2s < Tp ≤ 10s 10: 4s < Tp ≤ 10s	Cold state

Frequently Asked Questions (FAQs)

1. What is the GEYA LR2-D33?

The GEYA LR2-D33 is a heavy-duty thermal overload relay designed to protect industrial AC motors (50Hz/60Hz, up to 660V) from severe electrical overloads and phase failures, ensuring equipment longevity and operational safety.

2. What functions does it provide?

It provides core motor protection including overload and phase break (failure) detection. Additionally, it features temperature compensation to maintain accuracy in varying climates, a visual release indicator, a test button for maintenance checks, and selectable manual or automatic reset modes.

3. What are the key parameters affecting selection, and how does it differ from the LR2-D13 and LR2-D23?

The most critical parameters are the Rated Operation Current and the Main Circuit Cross-Sectional Area. While the LR2-D13 (up to 25A, M4 screws) and LR2-D23 (up to 36A/40A, M4 screws) are designed for light to medium motors, the LR2-D33 is built for heavy-duty applications. It handles a rated current up to 93A and features larger M10 terminal screws accommodating thicker wires (4~35 mm²). Choosing the correct model based on these parameters ensures precise tripping characteristics; an undersized relay will cause nuisance tripping, while an oversized one will fail to protect the motor.

4. What are the currently available options for the LR2-D33?

The LR2-D33 series offers multiple rectification current ranges to match your specific motor. Available models include: 3322 (17~25A), 3353 (23~32A), 3355 (30~40A), 3357 (37~50A), 3359 (48~65A), 3361 (55~70A), 3363 (63~80A), and 3365 (80~93A). It is designed to perfectly match GLC1-40~95 contactors.

5. What standards does it comply with and which markets is it designed for?

This product strictly conforms to the international IEC60947-4 standard and the Chinese GB14048.4 standard. It is engineered for global industrial markets, including manufacturing, HVAC, heavy machinery, and automated motor control systems.

6. What are the installation precautions?

Ensure the installation altitude is below 2000m and the ambient temperature remains between -5°C and +40°C. The vertical mounting inclination must not exceed 5°. The relay must be installed in a non-explosive environment free from corrosive gases, conductive dust, severe vibrations, and direct exposure to water or snow.

LR2-D33 Thermal Overload Relay