20
Shunt Trip Wiring
ChargePoint advises against installing an emergency stop (E-stop) button on charging stations.
Drivers can unintentionally trip the emergency shutoff, causing inconvenience and downtime to site
hosts. However, wiring to enable a remote shunt trip is standard on each Express 250. This shunt trip
wiring is activated when unsafe conditions are detected, such as a missing cover panel or a severe
impact. All shunt trip behavior is already hard-coded into the charging station and has no
programmable variables.
The Express 250 provides a set of unpowered (dry pair) contacts near the AC input terminals, to
connect to a shunt trip device. These contacts are rated to 440 VAC and 5 ARMS.
When a shunt trip is used, select a breaker with a shunt trip that is within the contact rating of the
Express 250 shunt trip contacts. Common ratings available for shunt trips are 12, 24, or 48 VDC, or
110-240, 400 VAC depending on the installation region. 480 VAC rated shunt trips may not be used.
Follow the installation guide provided by the breaker or shunt trip vendor. Control power is derived
at the electrical panel.
Note: For Paired charging stations, wire the connections so that a shunt trip activation on either
station trips the breakers of both Paired stations.
a. Electrical panel
b. Express 250
c. Circuit breakers
d. Shunt trip
e. Control power (fused)
f. Express 250 shunt trip terminal block (near AC terminals)
To Next Page
Loading...
