The Bulletin 5330 Electronic Frequency
Relay (EFR) master/slave system is designed to be used with
wound rotor motor controls. The master unit is a complete
frequency relay providing one point of frequency detection.
The master relay can be used as a stand-alone relay. The
slave unit must be used with the master unit and provides
additional points of frequency detection.
The Bulletin 5350 Static In-Line Timer is
a solid state timing unit for use in AC or DC contactor and
relay control. The timing unit is a series control element
having an adjustable timing range. Two units are
available. One with a timing range of 0.5 to 3.0 seconds,
another with a timing range of 2.5 to 16.0 seconds.
The Bulletin 5360, Hubbell Arc
Suppressor, is designed to reduce contact arcing in DC
control circuits where the inductive coil loads of
contactors and relays are interrupted. Utilization of the
Bulletin 5360 Arc Suppressor may eliminate the use of an
The Bulletin 5370 Electronic Overload
Relay receives line current signals from an ammeter shunt
and performs both the Inverse Time as well as the
instantaneous Trip functions normally performed by two (2)
separate electro-mechanical overload relays.