Siemens | MQJ380KL | Circuit Breaker | 80A | 3-Pole | 240V | Bolt-On

Meet the Siemens MQJ380KL circuit breaker — a purpose-built, bolt-on solution for 3-phase protection that combines reliability with straightforward installation. Rated at 80A and designed for 240V systems, this unit delivers solid overcurrent protection where three hot conductors must be safely interrupted together in a single operation.

Key Specifications

• Amperage: 80A
• Poles: 3-Pole
• Voltage: 240V
• Mounting: Bolt-On
• Part Number: MQJ380KL
• Brand: Siemens

Why this breaker stands out

Unlike plug-in counterparts, the MQJ380KL’s bolt-on design provides a secure, vibration-resistant installation ideal for demanding environments. With a precise 3-pole configuration, it ensures synchronized disconnection across all phase conductors, enhancing safety and reducing the risk of partial power loss in three-phase systems. The MQJ380KL is specifically aligned with Siemens’ legacy and current panels, offering a reliable path for maintenance, retrofit, or replacement projects where exact specifications matter.

Ideal use cases

• Retrofits in existing Siemens panels where 3-pole, 80A protection is required
• Replacement for failed or outdated 3-phase breakers in commercial or industrial electrical rooms
• Maintenance swaps during panel upgrades to preserve system protection ratings
• Service-entry or distribution panels that operate at 240V with balanced three-phase loads

Fit, compatibility, and ordering tips

To ensure a seamless fit, rely on the part number MQJ380KL as the best compatibility reference. Always confirm the breaker’s amperage, pole count, and voltage against your panel’s ratings before ordering. When planning an upgrade or replacement, verify that your panel model supports bolt-on 3-pole protection and that the bus design aligns with Siemens’ specifications for MQJ380KL.

Installation and safety notes

Power-down the electrical system and follow local codes during installation. Use proper PPE and verify that the circuit is de-energized before handling components. The bolt-on format is designed for a secure clamping onto the bus and mounting rails, helping minimize movement and stress on connections over time.

For reliable, industry-grade protection in 3-phase 240V applications, the Siemens MQJ380KL circuit breaker provides a precise, durable, and compatible solution tailored to retrofit, maintenance, and replacement needs. Add it to your order to ensure your system remains protected with a trusted Siemens reference.