Residual Current Circuit Breakers FI, NFI - - Thiết bị tự động hóa công nghiệp - ANS Vietnam

With a residual current circuit breaker (RCCB) the following protective measures are available: fault protection, protection against fire and additional protection in case of direct contact.

FEATURES:

• Isolating function

• Additional colour display of the position of main contacts (red – contacts closed, green – contacts open)

• A terminal shape prevents connection of a conductor outside the connection area
   

• Types:

1. Type A (designated NFI) – sensitive to alternating and pulsating dc residual operating currents
    
2. Type AC (designated FI) – sensitive only to alternating residual operating currents of a sine wave form
    
3. Type F (designated NFIF) – tripping is ensured as for type A and in addition for residual currents with mixed frequencies that can result from single-phase electrical loads with frequency inverters.
    
4. Type B (designated NFIB) – tripping is ensured as for type A and in addition for smooth d.c. residual currents, residual d.c. currents which may result from rectifying circuits and high frequency a.c. residual currents.
    

• Special versions:

1. Type S: A switch with a delayed break enabling selectivity regarding a general type and a short-time delayed type (type G) 
         connected on the load side
    
2. Type G: a short-time delayed breaking characteristic (a min. non-actuating period is 10 ms)
    
3. FIR-FIT combination: It is used for a protection in circuits where operational currents are higher than rated currents of residual current circuit breakers.

DOCUMENTATION

Catalogue NFI, FI

Catalogue NFIB

Catalogue NFIF

EC Declaration of Conformity for NFI

EC Declaration of Conformity for FI

VDE Certificate for NFI

VDE Annex to NFI Certificate

VDE Certificate for FI

EAC certificate