Siemens HED42B070 - 70 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens HED42B070 is a rugged 70A, 480V, 2-pole bolt-on molded case circuit breaker designed for dependable branch-circuit protection in panelboards and loadcenters. Its secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, helping prevent loosening and arcing in busy electrical spaces.

The built-in thermal-magnetic trip unit offers stable, repeatable protection by combining overload sensing with instantaneous short-circuit protection. This means predictable performance across temperature changes and varying load, which is essential for commercial and light-industrial environments where reliability matters.

Designed for seamless integration, the HED42B070 is compatible with matching OEM Siemens loadcenters and panelboards, ensuring a clean fit and straightforward replacement in existing systems.

What it’s ideal for

• Residential, commercial, and light-industrial 480V distribution setups requiring solid two-pole protection
• Upgrading aging or failed breakers in Siemens panelboards and loadcenters
• Applications where secure bolt-on mounting minimizes movement and maintains a reliable bus connection

Key specifications at a glance

• Amperage rating: 70 A
• Voltage rating: 480 V
• Number of poles: 2
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips for best results

• Verify you’re selecting a breaker that matches your Siemens panelboard or loadcenter for optimal bus alignment and secure mounting
• Tighten mounting hardware to the manufacturer’s specification to preserve the integrity of the bus connection in environments with vibration or temperature cycling
• Use this 2-pole unit for circuits where both lines must disconnect simultaneously in 480V systems, enhancing safety during maintenance or fault conditions