CIRCUTOR EMF-EMB Series - Manual (Page 7)

----- Static switching modules EM ---------- M98116701-20 Pág: 6
Figure 2.- Basic wire diagram for a three phase EM module.
• Three phase EMF or EMB modules consist of three circuit branches, each having a power
pack with two anti-parallel thyristors. Each module is provided with three input terminals and
six output terminals.
• Three phase EMB modules must be protected with three external fuses in series with L1, L2
and L3 line cables. The fuses type must be in accordance with the EM size and is given in
table 2. EMF modules have built in fuses.
• Single phase modules, EMB...-M, must be protected with two external fuses in series with
L1, and L2 line cables. The type and size of the fuses must be in accordance with the EM size
(see table 4)
5
BLOCK DESCRIPTION OF EM MODULES.
All the EM modules consist of two basic blocks: (See figures 2 and 3).
5.1 Static Power Block (BPE)
This block basically consists of two thyristors for each phase , the fuses (only in EMF... modules)
, the heatsink , the fan and the protection thermostat. The size of the power components depends
on the Q(kvar) of the capacitor which has to be switched