The ONESTO KRC3-463 Earth Leakage Circuit Breaker (RCCB) is a high-performance 4-pole residual current device designed to provide reliable protection against electric shock and earth leakage faults in three-phase electrical systems. With a 63A rated current, 30mA earth leakage sensitivity, and 415VAC operating voltage, it delivers fast and dependable protection for commercial, industrial, and residential three-phase installations.
The KRC3-463 continuously monitors the current flowing through all live conductors and the neutral. If an earth leakage current greater than 30mA is detected, the RCCB disconnects the supply instantly, helping protect people from electric shock while reducing the risk of electrical fires caused by insulation failures or ground faults.
Designed for use on 415VAC three-phase AC systems, the device features a rated conditional short-circuit current (Inc) of 6kA and a short-time withstand current (Icw) of 3kA, making it suitable for installation in modern distribution boards when paired with the appropriate upstream overcurrent protection.
Manufactured in accordance with IEC 61008-1 and VC8035 standards, the KRC3-463 provides residual current protection only and does not include overload or short-circuit protection. It should therefore be installed together with a correctly rated miniature circuit breaker (MCB) or fuse to provide complete circuit protection.
Its compact DIN rail-mounted design allows for quick installation in three-phase distribution boards, making it an ideal choice for electrical contractors, panel builders, OEMs, and maintenance professionals.
Features
Genuine ONESTO earth leakage circuit breaker (RCCB)
4-pole design for three-phase systems
63A rated current
30mA earth leakage sensitivity
Instantaneous earth fault protection
Suitable for 415VAC three-phase installations
6kA rated conditional short-circuit current (Inc)
3kA short-time withstand current (Icw)
DIN rail mounting
Compact modular construction
No overload or short-circuit protection
Manufactured to IEC 61008-1 and VC8035 standards
Specifications
Part Number: KRC3-463
Manufacturer: ONESTO
Product Type: Residual Current Circuit Breaker (RCCB)
Device Type: Earth Leakage Protection
Number of Poles: 4 Pole
Rated Current (In): 63A
Earth Leakage Sensitivity: 30mA
Rated Voltage: 415VAC
Network: Three Phase AC
Rated Conditional Short-Circuit Current (Inc): 6kA
Short-Time Withstand Current (Icw): 3kA
Overload Protection: No
Short-Circuit Protection: No
Mounting: DIN Rail
Standard: IEC 61008-1
Compliance: VC8035
Applications
Three-phase distribution boards
Commercial electrical installations
Industrial electrical systems
Manufacturing facilities
Motor control panels
Pumps and HVAC equipment
Building electrical infrastructure
Earth leakage protection
Personnel protection against electric shock
Residual current protection for three-phase AC circuits
What's in the box
1 x ONESTO KRC3-463 Earth Leakage RCCB 4 Pole 63A 30mA 415VAC 6kA
