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EMAS JA25D Thermal Overload Relay 0.42-0.63A 25A Motor Protection Relay
The EMAS JA25D is a thermal overload relay from the JA Series designed to provide reliable protection for electric motors against overload and phase failure conditions. Featuring a 25A rated current, adjustable thermal current range of 0.42A to 0.63A, AC-3 utilisation category, and manual or automatic reset capability, the JA25D is suitable for industrial motor control systems, automation panels, contactor assemblies, and machinery protection applications. ([emaselectric.com](https://www.emaselectric.com/products/l--contactors/ja--series/ja25d--ja-series25a-0-42-0-63a-thermic-relay?utm_source=chatgpt.com))
Product Overview
The EMAS JA25D thermal overload relay is designed to protect electric motors and electrical circuits from excessive current conditions that may cause overheating and equipment damage. It provides protection against overload and phase failure for both single-phase and three-phase motor applications. ([emaselectric.com](https://www.emaselectric.com/products/l--contactors/ja--series/ja25d--ja-series25a-0-42-0-63a-thermic-relay?utm_source=chatgpt.com))
With an adjustable thermal current calibration range of 0.42A to 0.63A, 25A current rating, IP20 protection, and manual or automatic reset functionality, the JA25D provides dependable motor protection for industrial control panels, automation systems, and contactor-based motor starters. ([ledcontrols.co.uk](https://www.ledcontrols.co.uk/emas-ja25d-emas-thermal-relay-0-42-0-63-a.html?utm_source=chatgpt.com))
Key Features
- Manufacturer: EMAS
- Product Series: JA Series
- Model: JA25D
- Thermal overload relay for motor protection
- 25A rated current
- Adjustable thermal current range: 0.42A-0.63A
- Protection against overload conditions
- Protection against phase failure
- Manual or automatic reset operation
- AC-3 utilisation category
- Suitable for single-phase and three-phase motor applications
- Compact design for industrial control panels
Technical Specifications
| Specification | Details |
|---|---|
| Brand | EMAS |
| Part Number | JA25D |
| Product Type | Thermal Overload Relay |
| Series | JA Series |
| Rated Current (Ie) | 25A |
| Thermal Current Calibration Range | 0.42A-0.63A |
| Usage Category | AC-3 |
| Operational Frequency | 50-60Hz |
| Mechanical Life | 100,000 operations minimum |
| Electrical Life | 100,000 operations minimum |
| Operating Frequency | 600 operations/hour |
| Insulation Voltage | 690V AC |
| Impulse Withstand Voltage | 6kV |
| Dielectric Strength | 1890V AC |
| Isolation Resistance | 10MΩ (500V DC) |
| Operating Temperature | -5°C to +40°C |
| Protection Rating | IP20 |
| Contact Material | AgNi |
| Cable Section | 1.5-2.5mm² |
| Screw Torque | 1.8Nm |
| Short Circuit Breaking Capacity | 50kA |
| Standard | TS EN 60947-4-1 |
Applications
- Electric motor protection circuits
- Industrial automation systems
- Motor starters and contactor assemblies
- Electrical control panels
- Pumps and fan motor protection
- Production machinery
- Industrial machine control systems
Frequently Asked Questions
What is the EMAS JA25D used for?
The EMAS JA25D is used to protect electric motors and control circuits against overload and phase failure conditions in industrial motor control applications.
What is the adjustment range of the JA25D?
The EMAS JA25D has an adjustable thermal current calibration range of 0.42A to 0.63A.
Can the EMAS JA25D protect three-phase motors?
Yes. The JA25D provides overload and phase failure protection suitable for both single-phase and three-phase motor applications.
Does the JA25D support manual and automatic reset?
Yes. The EMAS JA25D supports both manual and automatic reset operation for flexible motor protection requirements.
What protection rating does the EMAS JA25D have?
The JA25D has an IP20 protection rating and is designed for installation inside suitable electrical enclosures and control panels.
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