![](/html/2f/2fab/2fabfad2019f74b21acc49ce38babb36b12b625ae8b619e97243962f2f6e9db8/bg1.png)
3.88"
3.0"
.19" dia. typ.
5.5" 6.06"
2.08"
1.2"
MODEL 2734
MOTOR
STOP
START
M
M
M
CSR
TIME MARK is a division of
Current Sensitive
Relay
Adjustable Start-up Delay
Adjustable Trip Delay
Automatic or Manual Reset
DESCRIPTION
The Model 2734 Current Sensitive Relay monitors a
single-phase AC current for an over-current condition.
A top-mounted current transformer (CT) provides
complete isolation from the control voltage as well as
easy installation.
Operation begins when the current being monitored
rises to 10% of the trip setting, which initiates the startup delay. When the delay expires, over-current sensing
begins.
In the AUTO mode, the Model 2734 resets when current
drops below the trip setting. In the MANUAL mode, the
unit must be reset by momentarily switching to the
AUTO mode, and back, after the current fault is cleared.
The TRIPPED LED indicates the output relay status.
Current must drop below 10% of the trip setting for the
start-up delay to restart.
The standard model operates in a non-failsafe mode; if
control power is lost, over-current detection is lost.
SPECIFICATIONS
MODEL 2734
Operating Voltage 24VAC 120VAC
Voltage Range 21-30VAC 100-140VAC
Power Consumption
Frequency 60Hz
Over-current Range
CT Insulation Rating 600VAC
Dead Band ± 1% of trip setting
Trip Point Repeatability ± 2% of trip point
Trip Delay
Start-up Delay 0.5 to 6 seconds
Reset User selectable - Auto or Manual
Contacts SPDT 10A at 240VAC resistive
Expected Relay Life Mech: 10 million operations
Operating Temperature +32º to +140º F
Humidity Tolerance 0-97% without condensation
Enclosure Material ABS plastic
Weight 12 oz.
0.5W 2.0W
2-20 amps with 1 pass thru CT
1-10 amps with 2 passes thru CT
0.5-5 amps with 4 passes thru CT
0.2 to 2.5 seconds
Elec: 100,000 operations at rated load
TYPICAL APPLICATION
DIMENSIONS
11/2011
© 2011 TIME MARK CORPORATION
![](/html/2f/2fab/2fabfad2019f74b21acc49ce38babb36b12b625ae8b619e97243962f2f6e9db8/bg2.png)
MODEL 2734
M
o
t
o
r
C
u
r
r
e
n
t
Time
Start-up delay Trip delay
Trip set-point
Motor current
Relay trips
One pass = 2-20 amps
Two passes = 1-10 amps
Four passes = 0 5-5 amps.
TIME MARK is a division of
Current Sensitive Relay
READ ALL INSTRUCTIONS BEFORE INSTALLING, OPERATING OR SERVICING THIS DEVICE.
KEEP THIS DATA SHEET FOR FUTURE REFERENCE.
GENERAL SAFETY
POTENTIALLY HAZARDOUS VOLTAGES ARE PRESENT AT THE TERMINALS OF THE MODEL 2734.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
Installation Instructions
INSTALLATION
Mount the Model 2734 in a suitable enclosure.
Connect the AC and normally closed (N.C.) wiring to the
terminals with the contact markings (refer to the diagram on
the unit and the TYPICAL APPLICATION on the front page).
Pass the line to be monitored through the CT on the Model
2734. For a current range of 2-20 amps, use one pass
through the CT(See diagram below). For a range of 1-10
amps, double the line back and pass it through the CT a
second time. See formula below.
Apply operating power to the Model 2734. DO NOT START
THE MOTOR UNTIL THE DELAYS AND TRIP LEVEL ARE SET.
Range # of Passes
2-20 amps 1 Standard Range
1-10 amps 2 Non-standard
0.5-5 amps 4 Non-standard
* Non-standard Range Formula:
Standard range divided by the number of passes
OPERATION
During normal operation, the Model 2734 will energize
its control relay when an over-current condition occurs.
This is a non-failsafe condition. If the AC operating
power is removed from the Model 2734 while the motor
is operating, the Model 2734 will not operate the control
relay if an over-current condition occurs.
Operating characteristics of the standard Model 2734
are shown in the following graph.
ADJUSTMENT
Set the START-UP DELAY to the required time. This delay
prevents the Model 2734 from responding to the surge of
current caused by the motor start-up.
Set the TRIP DELAY to the required time. The TRIP DELAY
prevents the Model 2734 from responding to the momentary
current fluctuations during operation.
Set the CURRENT TRIP adjustment to the current level at
which you want the Model 2734 to trip off the motor. Set the
reset switch to either the AUTO or MAN position.
You can now start motor or load.
RESET PROCEDURE
In the AUTO Reset mode, the Model 2734 will de-energize its
relay when the over-current condition is corrected.
In the MANUAL Reset mode, first clear the over-current
condition. Then, slide the reset switch momentarily to AUTO,
then back to MANUAL. The Model 2734 will then reset and
be ready to resume monitoring.
WARRANTY
This product is warranted to be free from defects in materials
and workmanship for one year. Should this device fail to
operate, we will repair it for one year from the date of
manufacture. For complete warranty details, see the Terms
and Conditions of Sales page in the front section of the Time
Mark catalog or contact Time Mark at 1-800-862-2875.
© 2011 TIME MARK CORPORATION
11/2011