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Moulded Case Circuit Breakers (MCCBs)
Source genuine ABB Moulded Case Circuit Breakers (MCCBs) from Hagar, supported by local South African stockholding.
Tmax XT MCCBs provide dependable overload and short-circuit protection for commercial power distribution, industrial machinery and high-current electrical systems, with options ranging from simple thermal-magnetic protection to advanced electronic trip units.
Typically positioned downstream of main Air Circuit Breakers (ACBs), and upstream of final-circuit Miniature Circuit Breakers (MCBs) – ABB MCCBs form a critical part of coordinated low-voltage protection systems.
ABB MCCBs offer robust short-circuit protection capable of handling the operational stresses of the local power grid.
- ABB Tmax XT Series (XT1 to XT7): High-performance industrial MCCBs covering current ratings from 16A up to 1600A. Available with interchangeable Ekip electronic trip units for precise earth-fault coordination, load monitoring, and cloud connectivity.
- Specialised Trip Units: Includes specialised trip curves tailored specifically to handle motor starting inrush currents or to match the lower fault levels of standby generator alternators.
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Frequently Asked Questions
What is the main difference between ABB Formula and Tmax XT MCCB series?
The ABB Formula series is designed for standard, fixed application parameters up to 630A with pre-set trip units, making it a highly cost-effective choice for basic distribution panels. The Tmax XT series offers advanced, interchangeable electronic trip units, higher breaking capacities, and integrated connectivity options for complex industrial power management up to 1600A.
Can field accessories be easily retrofitted to ABB Tmax XT circuit breakers?
Yes, the Tmax XT range is highly modular. Accessories such as shunt trips, undervoltage releases, auxiliary contacts, and motorized operators can be installed quickly and safely directly in the field without requiring specialized tools or complex modifications to the breaker core.
Should I choose a thermal-magnetic or an electronic trip unit for my MCCB?
Thermal-magnetic trip units are ideal for standard commercial installations where basic overcurrent and short-circuit protection are required. Electronic trip units (like the Ekip range) are recommended for industrial plants because they offer precise adjustment curves, earth-fault protection, energy metering, and communication capabilities.
What do the Icu and Ics breaking capacity ratings mean on an ABB MCCB?
Icu (Ultimate Short-Circuit Breaking Capacity) is the maximum fault current the breaker can safely interrupt once without sustained damage. Ics (Service Short-Circuit Breaking Capacity) is the fault current the breaker can interrupt repeatedly and still remain fully operational. ABB breakers offer exceptionally high Ics ratings (often 100% of Icu), ensuring maximum operational resilience.
