Protection Relays
Current Monitoring Relays and Transducers
ECSW SERIES
Current Sensors
Description
The ECSW Series of single-phase, AC window, current sensors
includes adjustable overcurrent and undercurrent trip points.
Detects locked rotor, jam, loss of load, an open heater or
lamp load, a broken belt, or loss of suction. LED’s aid in trip
point adjustment and provide fault indication. The built-in
toroidal sensor eliminates the need for an external current
transformer. The output can be electrically latched after a fault,
or automatically reset. Remote resetting of a latched output
by removing input voltage. The unit includes switch selectable
zero current detection and normally de-energized or energized
output operation. Time delays are included to improve operation
and eliminate nuisance tripping.
Wiring Diagram
Features & Benefits
FEATURES
BENEFITS
Eliminates need to install stand alone
current transformer and provides isolation from
monitored circuit
Built-in toroidal
current sensing
Encapsulated
LED indication
Protects against shock, vibration, and humidity
Visual indication for trip point adjustment and fault
indication
L1
User selectable zero current detection, latched,
normally de-energized, or energized output adds
application flexibility
Multiple switch
selectable features
N/L2
Eliminates nuisance tripping and prevents
rapid cycling
Adjustable trip delay
MC = Motor Contactor
M = Motor
F = Fuses
RSW = Reset Switch
FSW = Fan or Float Contacts
CR = Control Relay
Isolated 10A, SPDT
output contacts
Allows control of loads for AC or DC voltages
OL = Overload
CS = Current Sensor
MCC = Motor Contactor Coil
Operation
When the input voltage is applied, sensing delay on startup
begins and the output transfers (if normally energized is
selected). Upon completion of the startup delay, sensing of
the monitored current begins. As long as current is above
undercurrent trip point and below the overcurrent trip point
(inside the window), the output relay remains in its normal
operating condition and both red LED’s are OFF. The green LED
glows when the output is energized. If current varies outside
the window, the associated red LED glows, and the trip delay
begins. If the current remains outside the window for the full
V = Voltage
I> = Adjustable Overcurrent
I< = Adjustable Undercurrent
W = Monitored Wire
∆T - AdjustableTrip Delay
Ordering Information
MODEL
INPUT VOLTAGE
TRIP POINT ADJUST. TRIP DELAY
SENSING DELAY ON STARTUP
CONNECT.
24VDC
ECSW3LABT
ECSW4HBHT
ECSW4LADT
ECSW4LBHT
ECSW4MACT
ECSW4MBHT
ECSW4MBGT
ECSW6MBHT
0.5 - 5A
5 - 50A
0.5 - 5A
0.5 - 5A
2 - 20A
2 - 20A
2 - 20A
2 - 20A
0.150 - 7s
0.5 - 50s
0.150 - 7s
0.5 - 50s
0.150 - 7s
0.5 - 50s
0.5 - 50s
0.5 - 50s
0.1s
6s
2s
6s
1s
6s
5s
6s
Terminal blocks
Terminal blocks
Terminal blocks
Terminal blocks
Terminal blocks
Terminal blocks
Terminal blocks
Terminal blocks
120VAC
120VAC
120VAC
120VAC
120VAC
120VAC
230VAC
If you don’t find the part you need, call us for a custom product 800-843-8848
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/ecsw
Rev: 1-A-062716