CQR2 Series Thermal overload relay
The CQR2 Series Thermal overload relay is a CHAC thermal overload relay for adjustable motor overload protection. The page keeps the model-specific technical table and original product images so buyers can verify voltage, current, configuration, mounting and applicable standards before ordering. Final suitability depends on the complete circuit, installation method and destination-market rules.
Product Overview
CQR2 Series Thermal overload relay is a thermal overload relay intended for adjustable motor overload protection. The current product record identifies it for motor starters, fans and pump control. Use the exact model variant and preserved technical source as the basis for procurement rather than assuming that every family member has the same rating.
Verified source summary: Type designation Selection Guide Instructions for Use CQR2 Series Thermal Overload Relay Panel Symbols and Functional Button Description Trip Test (Performed BEFORE energizing the main circuit): Open the cover. Press the test button with a screwdriver. The NC contacts will open and the NO contacts will close. The status change can be observed through the indicator window (yellow mark visible indicates tripped state;
Key Features
Typical Applications
Typical use can include motor starters, fans and pump control when the project confirms system voltage, current, fault or surge exposure, conductor and enclosure requirements, and the selected variant’s installation instructions. This page does not replace the project design or the authority having jurisdiction.
Applications and Selection Guide
Use the following decision points with the preserved model data. Product-family descriptions explain intent, but the exact technical table controls the ordered variant.
| Selection point | CQR2 Series Thermal overload relay | What the project must confirm |
|---|---|---|
| Application | Thermal Relay projects | Confirm the actual system and environment |
| Selection basis | adjustable motor overload protection | Use the exact model and technical table |
| Installation | Follow the model instructions | Check mounting, clearances and termination |
| Compliance | Use the listed standard where applicable | Verify edition, scope and destination rules |
| Adjacent product | Evaluate the related CHAC family where function differs | Do not substitute without engineering review |
Function
adjustable motor overload protection
Match the protection or switching function to the system.
Configuration
Model-specific options
Confirm current, voltage, poles, terminals or accessories from the table.
Installation
Mechanical and electrical fit
Check enclosure, mounting, wiring space and maintenance access.
Project evidence
Documents and test records
Retain the approved drawing, technical sheet and commissioning record.
Ordering Guide
- State the exact model and variant.
- Provide the system voltage, current, frequency and load or protection function.
- Confirm mounting, terminals, accessories, enclosure and environmental conditions.
- Share quantity, destination market and required technical documents.
Installation and Coordination Checks
- Verify the model’s ratings and connection arrangement against the project drawings.
- Check conductor, busbar, enclosure, clearances and tightening requirements using the product documentation.
- Coordinate upstream and downstream protection or control devices where applicable.
- Use qualified personnel for installation, testing, isolation and maintenance.
Type designation
Selection Guide
Instructions for Use
CQR2 Series Thermal Overload Relay Panel Symbols and Functional Button Description
Trip Test (Performed BEFORE energizing the main circuit):
Open the cover. Press the test button with a screwdriver. The NC contacts will open and the NO contacts will close. The status change can be observed through the indicator window (yellow mark visible indicates tripped state; mark hidden indicates reset state – see illustration above).
Reset Mode Setting (Performed BEFORE energizing the main circuit):
The relay leaves the factory set to manual reset mode. To select automatic reset mode, press and hold the reset button while turning it clockwise 90°. It is not advisable to change the reset mode while the circuit is energized and running.
Setting Current Adjustment (Performed BEFORE energizing the main circuit):
The relay leaves the factory set to the minimum setting current. To select a different setting current value, open the cover and turn the current setting dial with a screwdriver. Align the arrow on the dial with the current value corresponding to the full-load rated current of the motor being protected.
Emergency Stop:
Press the Stop Button. Pressing the stop button only opens the NC contacts; it does not affect the NO contacts. Releasing the stop button resets the NC contacts.
Dimensions (mm)
CQR2-25
CQR2-38
CQR2-95
Technical Specifications
| Product Model | CQR2-25 | CQR2-38 | CQR2-95 | ||
| Current rating | 25 | 38 | 95 | ||
| Rated insulation voltage V | 690 | 690 | 690 | ||
| Rated impulse withstand voltage V | 6000 | 6000 | 6000 | ||
| Enclosure protection grade | IP20(Front side) | IP20(Front side) | IP20(Front side) | ||
| Phase loss protection | ● | ● | ● | ||
| Manual and automatic reset | ● | ● | ● | ||
| Temperature compensation | ● | ● | ● | ||
| Tripping indication | ● | ● | ● | ||
| Test button | ● | ● | ● | ||
| Stop button | ● | ● | ● | ||
| Installation method | Insertable | Insertable | Insertable | ||
| Auxiliary contact | 1NO+1NC | 1NO+1NC | 1NO+1NC | ||
| AC-15220V rated current A | 2.73 | 2.73 | 2.73 | ||
| AC-15380V rated current A | 1.58 | 1.58 | 1.58 | ||
| DC-13220V rated current A | 0.2 | 0.2 | 0.2 | ||
| Cross-sectional area of conductor(mm²) | Main circuit | Single-core or stranded wire | 1 ~ 4 | 6~10 | 6~35 |
| Wire connection screw | M4 | M4 | M10 | ||
| Auxiliary circuit | Single-core or stranded wire | 1 ~ 2.5 | 1~2.5 | 1-2.5 | |
| Wire connection screw | M3.5 | M3.5 | M3.5 | ||
Tripping Characteristics
| Item | No. | Setting Current Multiple | Operating Time | Purpose / Test Condition | |
| Overload Protection | 1 | 1.05 | No operation within 2 hours | Starting from Cold State | |
| 2 | 1.2 | Operation within 2 hours | Starting from Hot State (after Item 1) | ||
| 3 | 1.5 | Operation within 2 minutes | Starting after reaching thermal equilibrium at setting current | ||
| 4 | 7.2 | 2S<TP≤10S | Starting from Cold State | ||
| Phase Failure Protection | 5 | Any Two Phases | One Phase | No operation within 2 hours | Starting from Cold State |
| 1 | 0.9 | ||||
| 6 | 1.15 | 0 | Operation within 2 hours | Starting from Hot State (after Item 5) | |
Adjustable Trip Setting Range
| Product Model | Current adjustment range RC(A) | Plug-in contactors | Short-circuit protection fuse (A) | |
| aM | gG | |||
| CQR2-25 | 0.1~0.16 | CQC6(SM/KMNC1)-09 CQC6(SM/KMNC1)-12 CQC6(SM/KMNC1)-18 CQC6(SM/KMNC1)-25 |
0.25 | 2 |
| 0.16~0.25 | 0.5 | 2 | ||
| 0.25~0.40 | 1 | 2 | ||
| 0.40~0.63 | 1 | 2 | ||
| 0.63~1 | 2 | 4 | ||
| 1~1.6 | 2 | 4 | ||
| 1.6~2.5 | 4 | 6 | ||
| 2.5~4 | 6 | 10 | ||
| 4~6 | 8 | 16 | ||
| 5.5-8 | 12 | 20 | ||
| 7~10 | 12 | 20 | ||
| 9~13 | 16 | 25 | ||
| 12~18 | 20 | 35 | ||
| 17-25 | 25 | 50 | ||
| CQR2-38 | 23-32 | CQC6(SM/KMNC1)-32 | 40 | 63 |
| 30~38 | 40 | 80 | ||
| CQR2-95 | 17~25 | CQC6(SM/KMNC1)-40 CQC6(SM/KMNC1)-50 CQC6(SM/KMNC1)-65 CQC6(SM/KMNC1)-80 CQC6(SM/KMNC1)-95 |
25 | 50 |
| 23~32 | 40 | 63 | ||
| 30~40 | 40 | 100 | ||
| 37~50 | 63 | 100 | ||
| 48~65 | 63 | 100 | ||
| 55~70 | 80 | 125 | ||
| 63~85 | 80 | 125 | ||
| 80~95 | 100 | 160 | ||
Accessories Description
| Application | Model number | Application |
| MB-1 | Combined with M12 to form an independent mounting product | |
 |
MB-2 | Combined with M25 to form an independent mounting product |
 |
MB-3 | Combined with M38 to form an independent mounting product |
 |
MB-4 | Combined with M95 to form an independent mounting product |
Why Choose CHAC
With 30+ years of manufacturing experience, 1100+ employees, 100M+ poles
annual capacity and 90% automated production, CHAC provides stable production capacity and strict
quality control for global OEM/ODM customers. Our in-house manufacturing system supports long-term
cooperation for electrical brands, importers and distributors.
30+
YEARS EXPERIENCE
Specialized in low-voltage electrical manufacturing
1100+
EMPLOYEES
Professional team ensures stable quality and delivery
100M+
POLES ANNUAL CAPACITY
Large-scale production capacity to meet global demand
90%
AUTOMATED PRODUCTION
Advanced automation for high efficiency and consistency
Automated Assembly Line
Testing Laboratory
Injection & Stamping
Quality Inspection
Strict quality control system ensures every product meets global standards.
What Can We Customize?
CHAC supports customization of coil voltage, auxiliary contact configuration,
electrical parameters, product branding,packaging design and engineering development according to customers’ equipment and market requirements.
Coil Voltage
AC and DC coil voltage options tailored to application requirements.
Auxiliary Contacts
Flexible auxiliary contact combinations for different control functions.
Electrical Parameters
Current ratings, protection ranges and functional parameters can be customized.
Product Branding
Private label logos, nameplates and product identification support.
Packaging Design
Custom cartons, labels, manuals and packaging solutions.
Engineering Development
Support from drawing optimization to product development and application matching.
Download
CQR2 Series Thermal Overload Relay
Complete product overview for low-voltage electrical components and product selection reference.
Need Technical Documents?
Contact us for datasheets, certificates, drawings, selection guidance or OEM/ODM project support.
CQR2 Product FAQ
What does the CQR2 protect?
It provides adjustable thermal overload protection for compatible AC motor starters. It is not a replacement for short-circuit protection.
How do I choose the relay range?
Select a range that contains the motor's rated current, then set it from the nameplate and installation conditions.
What is manual versus automatic reset?
Manual reset requires an intentional reset after a trip. Automatic reset can restart the control sequence when permitted by the machine risk assessment.
Does it detect phase failure?
The product record includes phase-failure protection. Confirm the exact variant, motor connection and test procedure.
Can it connect to a CQC6 contactor?
The page identifies CQC6 integration as an application. Confirm the mechanical interface and current range for the selected combination.
What should be recorded after testing?
Record the set current, trip test result, reset mode, auxiliary-contact operation and responsible technician.
Confirm the Right CQR2 Configuration
Send the exact model, operating conditions, quantity, destination market and required documents. CHAC will review the request against the published product data.
