Hach SC1500 Manuel De L'utilisateur page 14

Relay terminal connections to the mains circuit in permanent connection applications must have
insulation rated for a minimum of 300 V, 70 °C (158 °F). Terminals connected to the mains circuit
with a power cord connection must be double insulated and rated 300 V, 70 °C (158 °F) at both the
inner and outer insulation levels.
Terminal Description
1 Relay 1, NC
2 Relay 1, common
3 Relay 1, NO
4 Relay 2, NC
5 Relay 2, common
6 Relay 2, NO
NC = normally closed; NO = normally open
14 English
Table 4 Wiring information—relays
Terminal Description
7 Relay 3, NC
8 Relay 3, common
9 Relay 3, NO
10 Relay 4, NC
11 Relay 4, common
12 Relay 4, NO