Section 2 Installation Installing the Mains Breaker Unit
3BSE 027 941 R301 79
Installing the Mains Breaker Unit
The mains breaker unit is supplied in separate components that must be mounted
onto a DIN-rail in order to form a complete assembly. Different distribution options
are available, but for the sake of simplicity, the installation described covers the
redundant power supplies/independent power supplies option. See Figure 31 on
page 106 and Figure 32 on page 107.
Use the following procedure to correctly install the mains breaker unit:
1. Mount the mains breaker unit components onto the DIN-rail, from left to right,
close to the incoming power supply, in the order given below (see Figure 18 on
page 80).
a. A DIN-rail end-stop (1).
b. The terminal for the incoming protective ground (2).
c. The two terminals for the incoming Live and Neutral mains power (3).
These terminals are equipped with built-in jumpers which, if necessary,
can be opened to provide complete mains input power isolation.
d. The miniature mains breaker unit (4).
e. The protective ground distribution terminal (5).
f. The mains distribution terminal block (6), depending on the required
configuration.
g. A DIN-rail end-stop (1).
2. Connect the incoming mains, the protective ground terminals, the mains
breaker and the distribution terminals as shown in Figure 18 on page 80.
3. Install the two required links (7), fuse holders (8) and jumpers (9) onto
the distribution terminals. Fit the required fuses into the fuse holders, (glass
tube type, 5 x 20 mm (0.2 x 0.8 in)).
The protective ground terminal (2) is fitted with a knife-like device to provide
automatic grounding to the DIN-rail.
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