B370H - 70Amp Circuit Breaker

B370H - 70Amp Circuit Breaker

When dependable circuit protection matters, the Siemens B370H molded case circuit breaker delivers the performance electrical professionals trust for commercial and industrial power distribution systems. Designed for demanding applications, this 70 amp, 3-pole breaker provides reliable overload and short-circuit protection while helping keep electrical systems operating safely and efficiently. Its thermal magnetic trip mechanism responds quickly to changing electrical conditions, reducing the risk of equipment damage, downtime, and costly interruptions.

Built as part of the Siemens BLH series, the B370H features a 240V rating and a 22kA interrupting capacity, making it a strong choice for protecting panelboards, branch circuits, HVAC equipment, and other three-phase electrical systems where higher fault current protection is required. The bolt-on mounting design offers a secure fit and dependable connection inside compatible Siemens panelboards, while the compact construction helps simplify installation in tighter electrical spaces.

Contractors, facility managers, and maintenance professionals often choose the Siemens B370H for its combination of durability, consistent performance, and trusted Siemens engineering. Whether you're upgrading an aging electrical system, replacing a faulty breaker, or maintaining critical distribution equipment, this breaker is built to help keep your operation protected and running smoothly.

Key Features and Benefits

• Reliable 70 amp circuit protection for commercial and industrial applications: Designed to help protect electrical systems in demanding environments.
• 3-pole configuration designed for three-phase power systems: Suitable for three-phase electrical distribution applications.
• 240VAC voltage rating for low-voltage electrical distribution: Built for commercial and industrial electrical systems.
• High 22kA interrupting rating helps protect against fault currents: Suitable for applications where higher fault current protection is required.
• Thermal magnetic trip unit provides fast response to overloads and short circuits: Helps reduce the risk of equipment damage and downtime.
• Bolt-on mounting design ensures a secure and stable installation: Provides dependable connection inside compatible Siemens panelboards.
• Compact size makes installation easier in crowded panelboards: Helps simplify installation in tighter electrical spaces.
• Trusted Siemens BLH series performance: Built for dependable operation in commercial and industrial environments.
• Helps reduce equipment damage and electrical downtime: Designed to support safer and more reliable system operation.
• Ideal for replacement, maintenance, and new installation projects: Suitable for a wide range of electrical distribution applications.
  

Technical Specifications

• Manufacturer: Siemens
  
• Catalog Number: B370H
  
• Product Series: BLH
  
• Product Type: Molded Case Circuit Breaker
  
• Amperage Rating: 70 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 240VAC
  
• Interrupt Rating: 22kAIC
  
• Trip Type: Thermal Magnetic
  
• Mounting Type: Bolt-On
  
• Connection Type: Bolt-On
  
• Application: Electrical Distribution
  
• Standard Compliance: UL 489
  
• Dimensions:
  • 4 in. D
  • 3 in. H
  • 4 in. W
• Weight: 0.948 lb
  

Material Compliance and Certifications

• UL 489 Standards: The Siemens B370H breaker is manufactured to meet UL 489 standards for molded case circuit breakers, helping ensure dependable protection and performance in low-voltage electrical distribution systems.
• Industry Recognition: Siemens products are widely recognized throughout the electrical industry for quality manufacturing and long-term reliability in demanding environments.
  

Where It Works Best

• Commercial buildings
• Industrial facilities
• Manufacturing plants
• HVAC systems
• Panelboards and switchboards
• Electrical distribution equipment
• OEM machinery and control panels
• Three-phase power distribution systems
• Equipment protection applications
• Maintenance and retrofit projects