EATON Current Limiting Circuit Breaker Modules

Product Overview

Power demand continues to grow in new and existing facilities. To meet increased demand, larger utility supplies, spot networks and large facility transformers are installed. The increased capacity of the electrical source results in increased fault currents in excess of 100 kA short-circuit protection. Eaton manufactures non-fused current limiting modules with interrupting capacities up to 200 kA at 600 Vac or 70 kA at 690 Vac. Unlike fused current limiters with a one-time use, a current limiter module provides an automatic reset of the module after a shortcircuit event. Resetting the molded-case circuit breaker is the only action required to restore critical power to the system; there is no time wasted with sourcing the correct replacement fuses or module to bring system back online.

Product Description

The current limiting breaker modules use a unique contact design to enhance the system protection similar to that of the circuit breaker. When high short-circuit current is flowing through the contacts of these modules, the design results in very high interrupting capacities and improved current limiting characteristics.

Application Description

High-performance breakers are most commonly applied when very high fault levels are available and with applications where the current limiting capability is used upstream of the final load to limit current. Typical loads include lighting, power distribution, and motor control applications.

Features and Benefits

Superior system protection:

• Auto reset improves system uptime and eliminates the need for finding replacement parts
• No fuses to replace, reducing the overall cost of ownership and the waste created by fuses
• Overloads, by using inverse time current tripping characteristics of the molded-case circuit breaker
• Low-level short circuits, by using instantaneous and/or short-time delay tripping characteristics of the molded-case circuit breaker
• High-level short circuits, by using ultra-high-speed, blow-apart contacts of the current limiting module in series with the circuit breaker contacts
• Let-through currents, by improved opening speed of the contacts, the resultant rapid rise of arc voltage introduces impedance into the system

Standards and Certifications

• IEC 60947-2
• UL 489
• CSA C22.2

NOTES:
(1) 600Y/347V.
(2) Two interphase barriers included on line end mounted limiter; (2) line end of limiter. Four interphase barriers included on load end mounted limiter; (2) line end of breaker (2) load end of limiter

NOTES:
(1) Two interphase barriers provided, mounted on line end of limiter, catalog number FJIPBK.
(2) Four interphase barriers provided, (2) line end of breaker, (2) load end of limiter.
(3) Line and load terminals included with products listed above.