Siemens B315 Miniature Circuit Breaker

Siemens B315 is a 3‑pole, 15 A circuit breaker in the BL family rated for 240 V AC, with a 10 kA short‑circuit rating at 240 V. This molded‑case breaker is designed for panelboard mounting with bolt‑on installation and is specified for ambient temperatures up to 40°C. It provides thermal‑magnetic protection with distinct long‑time and instantaneous trip functions, making it suitable for protecting individual branch circuits in 240 V distribution panels used in commercial and light‑industrial electrical systems. The 3‑pole configuration supports three‑phase circuits while maintaining standard BL trip characteristics, and its 15 A rating makes it appropriate for general power distribution, lighting, and small‑motor circuits within appropriately sized Siemens panelboards. Commonly stocked by distributors and compatible with Siemens panel infrastructure, the B315 delivers dependable overcurrent protection where robust fault current protection and straightforward replacement are priorities.