41-201.4H CV Voltage Relay Class 1E
2
2.1. VOLTAGE UNIT (CV)
The overvoltage unit operates on the induction-disc
principle. A main tapped coil located on the center
leg of an “E” type laminated structure produces a flux
which divides and returns through the outer legs. A
shading coil causes the flux through the left leg (front
view) to lag the main pole flux. This causes the out-
of-phase fluxes to produce a contact opening torque.
The undervoltage unit operates on the same princi-
ple as the overvoltage unit except the shading coil is
on the right leg (front view). This causes the out-of-
phase fluxes to produce a contact opening torque.
2.2. INDICATING CONTACTOR SWITCH UNIT
(ICS)
The dc indicating contactor switch is a small clapper
type device. A magnetic armature, to which leaf-
spring mounted contacts are attached, is attracted to
the magnetic core upon energization of the switch.
When the switch closes, the moving contacts bridge
offers a low impedance to fundamental current and a
high impedance to third harmonic currents. Hence,
the relay has a low pickup value for fundamental volt-
age and much higher value of pickup for third har-
monic voltage. At rated voltage the electromagnet is
saturated causing the circuit to be detuned. The
impedance of the circuit is increased and limits the
fundamental current to a safe value. Figure 2 and 3
show CV-8 relays with adjustable pickup.
Internal schematics are shown in Figures 4 through
10 (beginning on page 9).
Photo not available at this time
Figure 1: Type CV Relay Without FT11 Case
Figure 2: 199 Volt Type CV-8 Relay With Adjustable
Pickup Without FT11 Case
Figure 3: 67 Volt Type CV-8 Relay with Adjustable Pickup
without FT-21 Case
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