Download Reset Switch or Normally Open Contact

Littelfuse Startco Protection Relays
Technical Note - Ground Fault
GF-04 : SE-701 REMOTE RESET
When a ground-fault trip occurs, the trip remains latched until the RESET switch is pressed, the
remote-reset terminals are shorted, or the supply voltage is cycled. The reset circuit responds only to
a momentary closure so that a jammed or shorted switch will not maintain a reset signal. Cycling the
supply voltage will not reset the trip LED.
Multiple SE-701 monitors can be reset simultaneously by a parallel connection of remote reset
terminals 6 and 7. In this configuration, all SE-701’s can be reset using a single contact, as shown:
6
6
RS
RS
UNIT 1
UNIT n
7
7
Reset Switch or
Normally Open Contact
The equivalent circuit of the reset input is shown below.
10K
6
RS
5V
To Reset Circuit
7
Maximum Low Reset Voltage
= 0.5 Vdc
Minimum High Reset-Release Voltage
= 3.5 Vdc
Maximum Output Current
= 0.5 mA
Minimum Reset Pulse Width
= 50 ms
© 2011 Littelfuse Startco
www.startco.ca
1
Pub. TN-GF04, December 4, 1999