Siemens HED42B090L - 90 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens HED42B090L is a 90A, 480V, 2-pole bolt-on molded case circuit breaker designed to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and loadcenters.

Built for demanding environments, the bolt-on mounting provides a secure, vibration-resistant connection to the bus bars, reducing movement under machinery or building vibrations and helping maintain reliable protection trip after trip.

The thermal-magnetic trip unit delivers precise protection by combining a fast magnetic trip for sudden short circuits with a calibrated thermal element that responds to sustained overloads, ensuring stable, repeatable protection performance across varying temperatures and load conditions.

Designed for OEM compatibility, this breaker is engineered to fit matching Siemens OEM loadcenters and panelboards, enabling straightforward retrofits, fewer compatibility concerns, and a clean, reliable installation.

Ideal for residential, commercial, and light industrial applications that require robust 90A protection on 480V circuits. Use cases include feeder protection, sub-feed panels, and service-entry protection in small to mid-size facilities where dependable, long-term performance matters.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: HED42B090L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 90A
• Voltage Rating: 480V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this bolt-on breaker stands out: the rigid, vibration-resistant bus connection minimizes movement that can lead to nuisance trips, while the thermal-magnetic protection adapts to real-world operating conditions for dependable, repeatable performance. When you need a compatible, high-value solution for Siemens panel families, the HED42B090L delivers a confident, plug-and-play upgrade or spare for critical electrical infrastructure.

Practical tips for use: plan for a 2-pole 480V configuration in systems that require line-to-line protection, verify panelboard compatibility with Siemens OEM components, and keep a few spare units on hand for quick service in commercial environments. This approach helps maintain uptime and simplifies maintenance in panels that demand consistent, long-term protection.