1
®
Bendix
®
TE-1
™
Trailer Emergency Stop Light Switch
SD-06-1801
FIGURE 1
TERMINALS
SPRING
PLUNGER
DIAPHRAGM
FIGURE 2
FIGURE 3
TE-1
™
TRAILER EMERGENCY STOP LIGHT SWITCH IN
TP-2
™
, TW-1
™
TRACTOR PROTECTION SYSTEM.
SUPPLY
SUPPLY AND
MOUNTING
PORT
OPTIONAL TE-1
™
TRAILER EMERGENCY
STOP LIGHT SWITCH
SUPPLY POINTS
TRAILER
EMERGENCY
TP-2
™
TRACTOR
PROTECTION VALVE
TE-1
™
TRAILER EMERGENCY STOP LIGHT SWITCH IN
TP-3
™
, PP-3
™
TRACTOR PROTECTION SYSTEM.
TW-1™ TWO WAY
CONTROL VALVE
PP-3
™
TRAILER
SUPPLY VALVE
SUPPLY
SUPPLY AND
MOUNTING
PORT
OPTIONAL TE-1
™
TRAILER
EMERGENCY STOP
LIGHT SWITCH
SUPPLY POINTS
TRAILER
EMERGENCY
TP-3
™
TRACTOR
PROTECTION VALVE
DESCRIPTION
The trailer emergency stop light switch is an electro-
pneumatic switch and lights the trailer stop lights if pressure
in the tractor emergency line reduces to approximately 60*
psi for any reason, or if the tractor protection valve is operated
manually.
Referring to Figure 1 (Sectional View), with air pressure
above approximately 60* psi in the line in which the switch
is connected, air pressure acting upon the diaphragm under
the plunger overcomes pressure of the spring and keeps
the contacts separated.
If air pressure in the air brake system reduces to
approximately 60* psi for any reason, the spring overcomes
the pressure under the diaphragm, closes the contacts and
lights both tractor and trailer stop lights.
Continued reduction of air pressure will disconnect tractor
stop lights but the trailer stop light will continue to light.
*Older switches were set at 55 psi.
