Siemens SB4AS12 4A Circuit Breaker

Meet the Siemens SB4AS12 4A Circuit Breaker — a genuine Siemens replacement designed to deliver dependable overcurrent protection for compact, low-current circuits in compatible panels. With a precise 4 amp current rating, this breaker helps safeguard wiring and devices by interrupting current when loads exceed safe levels.

Key details

• Current rating: 4 A
• Part Number: SB4AS12
• Manufacturer: Siemens
• Type: Circuit breaker designed for use in Siemens panel systems requiring SB4AS12

The SB4AS12 is a direct-replacement component for Siemens installations that require a 4-amp protection device. It’s designed to maintain the electrical system’s safety and reliability by providing predictable trip behavior when overloads or fault conditions occur.

Where it shines

• Small or control circuits within industrial, commercial, or residential electrical systems where a conservative 4 A protection level is appropriate.
• Replacement part to restore or upgrade an aging Siemens panel without changing the surrounding wiring or devices.

Why choose this Siemens SB4AS12 breaker? It’s a trusted, genuine part from Siemens, built to integrate smoothly with compatible panels and components. By matching the exact current rating and form factor, it helps maintain system coordination, reduces nuisance trips, and supports ongoing safety for your electrical setup.

How it helps your day‑to‑day work

• Protects insulation and conductors from overheating in circuits drawing up to 4 A.
• Facilitates safe operation of low-current devices or control logic in panels designed for SB-series breakers.
• Provides a straightforward replacement path when upgrading or repairing Siemens electrical installations.

Practical tips

• Verify that your panel accepts SB4AS12 breakers and that the 4 A rating matches your circuit’s protection needs.
• Keep a spare SB4AS12 on hand for quick replacement after a trip or during routine maintenance of Siemens-based systems.