Terasaki Electric TO-100BA Circuit Breaker 75A 500V 18KA 3-Poles

Terasaki Electric TO-100BA Circuit Breaker delivers reliable, three‑phase protection for demanding electrical systems. With a 75A current rating, a 500V maximum voltage, and an impressive 18kA interrupting capacity, this 3‑pole breaker is built to withstand high fault currents while providing precise, dependable protection for your distribution panels.

Designed for professional installation across industrial, commercial, and challenging residential applications, the TO-100BA excels in panel upgrades, retrofit projects, and maintenance replacement work. It’s a trusted component for electricians, panel builders, and MRO teams who need equipment that won’t compromise system safety or uptime.

Key specifications

• Amperage rating: 75A
• Voltage rating: 500V
• Interrupting capacity: 18kA
• Poles/configuration: 3‑Pole
• Series/model: TO‑100BA

Why this breaker stands out

Three‑pole protection means synchronized disconnection across all phases, reducing the risk of unbalanced faults and equipment damage in three‑phase motors and feeders. The 18kA interrupting capacity provides robust protection in installations with higher fault currents, helping to safeguard conductors, switchgear, and downstream equipment during a short circuit. Built by Terasaki Electric, this unit embodies a heritage of trusted performance and is designed to integrate smoothly into established panels and distribution schemes.

Ideal use cases

• Panel upgrades where you need reliable, three‑phase protection that matches existing system voltage and fault characteristics
• Retrofit projects replacing aging breakers with a modern, trusted 3‑pole unit
• Maintenance replacements in service fleets and job sites that require durable, readily available spare parts
• Commercial and light industrial applications with motor loads and three‑phase distribution

Practical considerations and tips

When selecting the TO‑100BA, ensure the system voltage and protection level align with your distribution panel and wiring configuration. This breaker is intended for use in systems up to 500V and for three‑phase circuits, delivering coordinated protection across all phases. For service teams and contractors, having the TO‑100BA on hand as a spare can shorten downtime during maintenance outages and simplify stocking strategies for recurring panel work.

In short, the Terasaki TO‑100BA 3‑pole breaker combines a proven protection platform with a clear specification set that suits mid‑range industrial, commercial, and demanding residential environments. Its blend of 75A capacity, 500V rating, and 18kA interrupting capacity offers a solid, future‑proof option for reliable electrical distribution and quick, confident replacements when it matters most.