AC MCCB

The short-circuit breaking capacity of Suntree AC molded case circuit breakers varies by model and voltage rating. The SM8 series offers breaking capacity of 25-50kA, while the SM8 series offers 36.5-50kA at AC800V and 15kA at AC1000/1140V. For higher voltage applications, the SM8 series 250-800A models provide single-phase AC800-1140V breaking capacity of 10kA.

Suntree molded case circuit breakers use thermal-magnetic trip mechanisms, primarily providing two-stage protection functions: overload protection (long-time) and short-circuit instantaneous protection. For applications requiring three-stage protection including short-time selective protection, please confirm whether electronic trip versions are selected and contact technical support for parameter setting methods. Currently, the SM8 series features special arc extinguishing design ensuring fast interruption of short-circuit currents.

The SM8HU series is an AC molded case circuit breaker, available in ratings including 250A, 315A, 400A, 630A and 800A. The SM8E series is an electronic trip circuit breaker, also available in the same ratings of 250A, 315A, 400A, 630A and 800A.

Suntree SM8 series AC800V breakers are primarily suitable for industrial distribution systems and high-voltage applications. According to product information, AC800V breakers can be used in single-phase AC800-1140V systems with a breaking capacity of 10kA. Specific application scenarios include large industrial plant distribution, mining equipment power supply, high-voltage motor starting and protection, and new energy generation systems such as the AC side of large-scale PV power plants where high voltage ratings are required. The series features advanced arc extinguishing and current-limiting technology ensuring fast interruption of short-circuit currents.

Fixed installation offers simple structure, lower cost, and reliable connections, but requires power outage and wiring disconnection for maintenance or replacement, suitable for scenarios where breakers do not need frequent replacement. Plug-in or draw-out installation facilitates maintenance and replacement, allowing breakers to be withdrawn for inspection without disconnecting wiring, suitable for applications with high requirements for power supply continuity and quick replacement, but comes with higher cost and larger installation space requirements.