Siemens 5SY4125-5 - 25A, 400VAC, 1-Pole, Circuit Breaker

Meet the Siemens 5SY4125-5 — a compact, reliable protection device engineered for single‑phase power networks. This 25A circuit breaker is rated up to 400VAC, delivering dependable overcurrent protection where it matters most in industrial, commercial, and OEM environments. With its 1‑pole configuration, it’s designed for flexible integration in panelboards, switchboards, and control panels.

What makes the Siemens 5SY4125-5 stand out

• Precise single‑pole protection ideal for single‑phase feeders and control circuits within distribution panels.
• 25A rating at 400VAC supports common control and light‑to‑medium load applications without oversizing components.
• Robust Siemens engineering you can trust for consistent performance in demanding environments.
• Versatile installation compatible with panelboards, switchboards, and motor control centers, enabling streamlined layouts and easier maintenance.
• OEM friendly a reliable choice for original equipment manufacturing where dependable protection is non‑negotiable.

Ideal use cases

• Single‑phase feeds in control panels and motor control centers where space is at a premium.
• Maintenance and distribution panels in commercial settings that require dependable current interruption up to 25A.
• OEM equipment where a compact, easy‑to‑source protection device helps simplify assembly and serviceability.

Why this matters for your system

Choosing the Siemens 5SY4125-5 means you’re selecting a proven protection strategy for overcurrent scenarios, helping minimize downtime and equipment damage. The 1‑pole design reduces unnecessary complexity in single‑phase circuits, while the 400VAC rating accommodates a broad range of distribution scenarios. Its compatibility with standard panel architectures makes it easy to spec, install, and stock for ongoing maintenance.

Specifications at a glance

• Current rating: 25A
• Voltage rating: 400VAC
• Poles: 1‑Pole
• Breaker type: Circuit Breaker
• Applications: panelboards, switchboards, control panels, industrial and commercial power distribution, OEM equipment

Practical tips for use

• Verify that your panel or switchboard supports a 1‑pole, 400VAC protection device and that the 25A setting matches the load profile of the circuit.
• When wiring, follow manufacturer torque specifications to ensure reliable electrical contact and consistent trip performance.
• Use this breaker as part of a holistic protection strategy that includes proper enclosure, labeling, and periodic inspection as part of routine maintenance.