65Instruction Booklet IB 33-790-1JEffective November 2010Instructions for Low Voltage PowerCircuit Breakers Types DS and DSLEaToN CorPoraTIoN www.eaton.comFig. 69 Overcurrent Trip Switch.Three contact arrangements are available as standard:(1) two normally open, (2) two normally closed, or (3) onenormally open and one normally closed contact. Theseare independently wired to secondary disconnect con-tacts at the rear of the breaker unit. Some special unitsmay have one or two additional contacts.The device is latch-type and must be manually reset bymeans of a pushbutton on the breaker front panel. Alsoavailable is an electric reset for remote operation. Figures69 and 70 illustrate an electric reset device.8.7.3 High Load Switch (available with Amptector l-A only)This is a self-resetting solid-state device which picks upon an overload condition at a lower pick-up value than thebreaker overload trip setting of the Amptector trip unit. Itsfunction is to give advance notice of an overload condi-tion before the breaker trips. See Figure 71.The pick-up point is adjustable from 60% to 100% of theAmptector trip long delay pick-up setting. The non-adjust-able time delay of 60 seconds requires that the pick-up cur-rent be maintained for that interval to cause the relaycontact to operate. If the load current falls below the pick-uppoint, the timing resets in about a second. The relay hasone normally open and one normally closed contact with acommon connection. Its built-in power supply requires areliable sinusoidal source of either 120 or 240 volts AC.Fig. 70 Overcurrent Trip Switch Operation.Fig. 71 High Load Switch.
