Siemens B325H - 25 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens B325H is a dependable 25A, 240V, 3-pole molded case circuit breaker designed to protect branch circuits and guard against short circuits in panelboards and load centers. Built for reliability, it combines a secure bolt-on mounting with a precise thermal-magnetic trip unit to deliver stable, repeatable protection where it matters most—in homes, businesses, and light industrial environments.

Key Features

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays seated under operation and reduces the risk of loose connections over time.
• Thermal-magnetic trip unit provides stable, predictable protection against both overloads and short circuits, with trip characteristics that respond consistently across conditions.
• OEM-compatible design—works with matching Siemens OEM load centers and panelboards for a seamless fit and electrical compatibility.
• Versatile for multiple settings—appropriate for residential, commercial, and light industrial applications where reliable overcurrent protection is required.

Specifications at a Glance

• Manufacturer: Siemens
• Part Number: B325H
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 25A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why Choose the Siemens B325H?

When you need reliable protection for 3‑phase or multi‑pole circuits, the B325H delivers. The bolt-on mounting creates a solid bus connection that resists vibration and reduces the chance of conductor movement, which can compromise protection over time. The thermal-magnetic trip unit ensures fast and repeatable shutdowns when current exceeds safe levels, helping minimize equipment damage and downtime. Designed to pair with Siemens OEM load centers and panelboards, it offers a tested, engineered fit that simplifies installation and maintenance.

Use Cases and Practical Scenarios

• Residential systems requiring stable 3-pole protection in multi‑wire configurations or 3‑phase sections of a panelboard.
• Commercial electrical rooms where vibration is a concern—for example, in spaces with heavy equipment or frequent door openings that can loosen connections.
• Light industrial enclosures and service panels needing reliable overcurrent and short‑circuit protection with easy bolt-on installation.
• Retrofits or new installations where OEM compatibility ensures consistent electrical characteristics and streamlined replacement.

Installation and Care Tips

Install in a compatible Siemens panelboard or load center following the manufacturer's guidelines. Ensure the power is off before installation, and use the correct torque and tightening procedures as specified by the panel manufacturer. Keep the breaker seated firmly in the bus connection, and verify that the enclosure is free from contamination that could affect performance. For future maintenance, stock a spare B325H to minimize downtime in critical applications.

Bottom Line

The Siemens B325H 25A, 240V, 3-pole bolt-on circuit breaker delivers robust, dependable protection for a wide range of panelboards and load centers. With a secure mounting design, a predictable thermal-magnetic trip, and OEM-compatible integration, it’s a practical, long‑term solution for safeguarding electrical systems in residential, commercial, and light industrial settings.