Time Mark 273 Data Sheet
1.95"
1.95"
3.25"
MODEL 273
TIME MARK is a division of
Single Phase
Current Monitor
Adjustable trip point
Over or under current sensing
5 or 10 amp adjust range options
Five year unconditional warranty
DESCRIPTION
The Model 273 Single Phase Current Monitor is a
single setpoint sensor. It can be used as either an over
current or under current sensor, depending on the
contacts used.
This device can directly monitor AC currents in the
range of 0.5 to 5 amps; or 2 to 10 amps, 50 to 400Hz.
Matching transformers are available to extend the use
of the monitor to most any range. The current being
monitored can be of any voltage, up to the rating of the
socket. An LED indicator is provided to show when the
relay is energized.
The Model 273 is available for either 24VAC or
120VAC supply voltages. Model 273-5 is UL
Recognized and CSA Certified. All versions use a
standard 8-pin socket.
APPLICATION: Typical Over-current sensing
SPECIFICATIONS
Model 273-X-XX
Current range
Supply voltage 24VAC or 120VAC
Power consumption 1 watt max
VA burden
Frenquency range 50-400Hz
Repeat accuracy 1% max
Dead band 4% max
Reset Automatic
Output contacts SPDT 10A at 240VAC resistive
Expected relay life Mechanical: 10 million operations
Electrical: 100,000 at rated load
Operating temperature -20° to +131° F
Humidity tolerance 0 - 97% w/o condensation
Enclosure material ABS plastic
Mounting 8-pin socket ( **sold separately)
Weight
Agency approvals 273-5 is UL Recognized and CSA Certified
0.5 to 5 amps or 2 to 10 amps*
Less than 0.5 VA
6.4 oz.
* 273-10 has NO Agency approvals
** Order 8-pin socket number 51X120
ORDERING INFORMATION
SPECIFY: Model - Current - Oper Voltage (e.g. 273-5-120)
DIMENSIONS
Shows No Power Applied
11/2011
© 2011 TIME MARK CORPORATION
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AC
CURRENT
SUPPLY
MODEL 273
TIME MARK is a division of
Single Phase Current Monitor
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 273.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
Installation Instructions
INSTALLATION
Using the Model 273 base diagram, pictured on the unit
(contacts shown in the de-energized condition), connect
operating voltage and current input wiring to the socket.
PIN DRAWING
ADJUSTMENT SETTINGS
The output contacts used will depend on whether the Model
273 is applied to detect over current, under current, to shut off
a load, or trip an alarm.
The internal relay will energize when the input current rises
above the Current Adjust setting. This allows the unit to be
set to detect over-current (relay will energize on fault). The
LED indicator will illuminate whenever the relay is energized.
Apply normal operating current, then adjust the Model 273
Monitor until the relay just trips or resets, depending on the
application. This will result in the unit tripping on relatively
small current changes.
APPLICATION: Typical Under-current sensing
Shows No Power Applied
APPLICATION: Typical Over-current Alarm
NOTE: When installing the Model 273 Current Monitor in
areas of high humidity or contamination, it is recommended
that the base area and all exposed metal parts of the socket
be coated liberally with a good quality silicone grease, such as
Dow Corning DC-4 or DC-4X. Insert the unit into the socket
and wipe off excess grease around the base. This will prevent
the entrance of moisture and other contaminates into the base
and socket areas.
WARNING
IN APPLICATIONS WHERE VOLTAGES IN EXCESS OF
300VAC ARE TO BE MONITORED, BE CERTAIN TO USE
THE TIME MARK MODEL 51X120 8-PIN SOCKET, OR AN
EQUIVALENT UL APPROVED 600VAC RATED SOCKET.
Shows No Power Applied
TROUBLESHOOTING
Should the Model 273 Monitor fail to operate properly, check all
connections to the monitor, and to the control circuits. Verify that
the proper voltage and currents are present, and check all fuses.
WARRANTY
This product is warranted to be free from defects in materials
and workmanship, and is covered by our exclusive 5-year
Unconditional Warranty. Should this device fail to operate for
any reason, we will repair it for five years 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
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