• Residual Current Circuit Breaker - RCCB
• Shape compatible with and suitable for standard busbar connection to other devices
• Twin - purpose terminal [lift/ open - mouthed] above and below
• Busbar positioning optionally line or load
• Free terminal space despite installed busbar
• Contact position indicator red - green [Fi7 - 4 pole]
• Suitable for being used with standard fluorescent tubes with or without electrical ballast [typically up to 20 units per phase conductor]
• The device functions irrespective of the position of installation
• Types with BOA permissible short-circuit back-up fus e: Take into account overload protection
• Tripping is line voltage-indepedent. Consequently, the RCCB is suitable for "Fault current/residual current protection" and "additional protection" within the meaning of the applicable installation
• Mains connection at either side
• The 4-pole device can also be used for 3-pole connection. For this purpose use terminals 1-2, 3-4 and 5-6.
• The 4-pole device can also be used for 2-pole connection. For this purpose use terminals N-N and 5-6.
• Pressing the test key 'T• serves the only purpose of function testing the residual current  circuit  breaker [RCCB].

This test does not make earthing resistence measurement [ R El, or proper checking of  the  earth  conductor condition redundant, which must be performed separately.