Designed for high-density power distribution, the LEJ & LEJA Series combines compact dimensions, high interrupting capacity and dependable hydraulic-magnetic trip technology. The result is reliable protection for mission-critical equipment where uptime and system availability are essential.
The Sensata LEJ & LEJA Series Hydraulic-Magnetic Circuit Breakers are designed to meet the growing demands of modern data centers, telecommunications equipment and industrial power distribution systems. Combining UL489 certification, high interrupting capacity and support for AC systems up to 277VAC per pole, they provide reliable circuit protection in applications where power density, uptime and equipment reliability are critical.
Based on the proven LEG/LEGA platform, the LEJ & LEJA Series incorporates advanced arc-quenching technology while maintaining the compact footprint required for today’s high-density electrical equipment. Typical applications include rack Power Distribution Units (PDUs), telecom power supplies, industrial control panels and other equipment operating from 208VAC to 277VAC.
Unlike conventional thermal circuit breakers whose trip characteristics can be affected by ambient temperature, the LEJ & LEJA Series provides stable hydraulic-magnetic protection with consistent performance across a wide range of operating conditions.
Additional advantages include:
The LEJ & LEJA Series was developed specifically for applications where panel space is limited but electrical performance cannot be compromised.
Typical applications include:
Both product families offer identical electrical performance and certification.
The main difference is mechanical construction.
LEJ is the standard version.
LEJA features a low-depth design that reduces installation depth by approximately 31%, making it ideal for compact equipment where every millimeter of enclosure space is valuable.
| Parameter | Value |
|---|---|
| Technology | Hydraulic-Magnetic |
| Poles | 1 or 2 |
| Current Rating | 2-30A |
| Voltage | Up to 277VAC per Pole |
| Interrupt Rating | Up to 10kA |
| Certifications | UL489, TÜV EN60947-2 |
| Mounting | Panel Mount |
| Handles | Toggle / Rocker |
| Versions | LEJ / LEJA |
The LEJ & LEJA platform offers extensive configuration options to simplify integration into OEM equipment.
Available options include:
| Parameter | Value |
|---|---|
| Technology | Hydraulic-Magnetic |
| Poles | 1 or 2 |
| Current Rating | 2A to 30A |
| Voltage | Up to 277VAC per pole |
| Interrupting Capacity | Up to 10kA |
| Certifications | UL489, TÜV EN60947-2 |
| Frequency | 50/60Hz |
| Trip Curves | 61, 62, 63, 69 |
The LEJ & LEJA Series is widely used in:
Amironic provides engineering support for selecting the appropriate current rating, delay curve, interrupting capacity and mechanical configuration for your application.
Contact our engineering team for technical assistance, availability and pricing.
Both series offer the same electrical performance, certifications and hydraulic-magnetic protection technology. The primary difference is the mechanical design. The LEJA Series features a low-depth construction that reduces installation depth by approximately 31%, making it ideal for compact equipment and high-density enclosures.
The LEJ & LEJA Series is specifically designed for rack Power Distribution Units (PDUs), data centers, telecommunications power systems, UPS equipment, industrial control panels and other AC power distribution applications requiring reliable branch circuit protection.
The series is available with current ratings from 2A to 30A and supports voltages up to 277VAC per pole, depending on the specific model and certification.
Depending on the model, the series provides short-circuit interrupting capacities of up to 10,000A (10kA), making it suitable for demanding commercial and industrial installations.
Yes. The LEJ & LEJA Series is available with multiple delay characteristics, including short delay, medium delay, long delay (motor start) and 125% instant trip, allowing engineers to select the appropriate protection for different load types.
Yes. The series offers multiple configuration options, including one- or two-pole versions, toggle or rocker actuators, quick-connect or screw terminals, flat bus terminals, handle locks, safety guards and various mounting configurations.
A circuit breaker that uses magnetic force and a hydraulic delay mechanism to provide consistent trip performance with minimal influence from ambient temperature.
The North American safety standard for branch circuit protection circuit breakers used in commercial and industrial electrical systems.
The maximum short-circuit current that a circuit breaker can safely interrupt without being damaged. The LEJ & LEJA Series offers ratings up to 10kA, depending on the model.
A power distribution device installed inside a server rack that distributes AC power to servers, switches and networking equipment while providing branch circuit protection.
Protection of individual electrical circuits against overloads and short circuits, helping prevent equipment damage and electrical hazards.
The time-current characteristic that determines how quickly a circuit breaker trips when current exceeds its rated value. Different delay curves are available to accommodate various types of electrical loads.
A mechanical design that reduces the installation depth of the circuit breaker. In the LEJA Series, the low-depth construction allows easier integration into compact electrical equipment and high-density enclosures.
