The PEF-301 universal automatic electronic phase switch is a microprocessor-based single phase unit of automatic throw-over circuit-breaker that performs monitoring of voltage presence & quality on phases. The switch is designed to supply an industrial/ appliance single-phase 220V/50Hz load from three-phase four-wire mains 3x380+N in order to maintain uninterrupted power supply of essential single-phase loads and protect them against unallowable voltage variations in the mains. The PEF-301 provides a simple and correct solution to enhance electric power supply reliability of single phase loads and to protect them from unallowable voltage variations in the mains.
Any power load is energized with the interposition of the PEF-301:
- if power is less than 3,5 kWt (16A), the load is energized from the PEF-301 directly;
- if power is more than 3,5 kWt (16A), the PEF-301 controls magnetic starter single phase coils of the corresponding power.
- Trip threshold for Umin: 160 – 210V
- Trip threshold for Umax: 230 – 280V;
- Reset delay and the initial load energization delay Ton: 1—600 sec;
- Return delay to the priority phase, Tr: 5 – 200 sec range.
FEATURES
- high trip threshold accuracy is provided;
- the option of phase priority bringing in/exclusion is available;
- switching to the phase with unallowable parameters is not effected;
- any power load can be energized;
- an automatic selection of the optimum phase;
- a high speed of switching is provided;
- monitoring of voltage presence & quality on phases;
- when sticking of magnetic starter power contacts in external circuit occurs the switching is disabled;
- starting transient voltage drops ignoring is provided;
- voltage hysteresis exists;
- higher power of output contacts allows in some instances to do without magnetic starters;
- there are four independent wide-ranged adjustments for basic parameters;
- there are three LEDs that indicate the phase the load is energized from and the fault-indicating LED;
- due to digital technology the relay trip settings are adjusted quite accurate and so one doesn’t need to read voltage on the control voltmeter;
- a procedure of trip thresholds setting is very simple;
- a wide range of operating temperatures is provided;
- mounted on a standard DIN-rail;
- low power demand;
- small dimensions and small weight of the relay.
