DESCRIPTION
The Model 252 3-Phase Monitor continuously monitors
3-phase power lines for abnormal conditions. When
properly adjusted, the Model 252 will detect phase loss
on a loaded motor even when regenerated voltage is
present.
This device consists of a solid-state voltage and phase-
angle sensing circuit, driving an electromechanical relay
with one SPDT and one SPST contact. When correct
voltage and phase rotation are applied, the internal
relay will energize. A fault condition will de-energize the
relay. When the fault is corrected the Model 252 will
automatically reset.
The Model 252 does not require a neutral connection
and can be used with WYE or DELTA configured
systems. Four versions cover 120V, 208/240V and
480V, 60Hz, and 380V, 50Hz. Adjustment ranges are
sufficiently wide to allow for proper adjustment to
existing conditions. Two LED indicators are provided to
aid in adjustment and system troubleshooting.
ll Detects Phase Loss, Low Voltage
and Phase Reversal
ll 50 Hz and 60 Hz versions
ll Automatic Reset
MODEL 252
3-Phase Monitor
L1
L2
L3
M
M
M
MOTOR
O/L's
Start
Remote
Indicator
Lamp
Stop
Control
Voltage
Model
252
M
3 4
5
6 1
2
8
7
TYPICAL APPLICATION
TIME MARK is a division of
Telephone: Main - (918) 438-1220
Sales - (800) 862-2875
Fax: (918) 437-7584
E-mail: sales@time-mark.com
Internet: http://www.time-mark.com
Doc No. 87A373 12/00
© 2000 TIME MARK CORPORATION
11440 East Pine Street
Tulsa, Oklahoma 74116
DIMENSIONS
Shows No Power Applied
SPECIFICATIONS
Model B252B 252B A252B EX252B
Nominal AC Voltage 120VAC 208/240VAC 480VAC 380VAC
Adjustment Range 85-120VAC 160-240VAC 380-480VAC 300-380VAC
Frequency 60 Hz 50Hz
Power Consumption 0.25 W 0.50 W 1.5 W 1.25 W
Transient Protection 2500V for 10 msec
Repeat Accuracy 0.1% of set point (fixed conditions)
Response Time 0.05 seconds
Reset Time 0.05 seconds
Reset Type Automatic
Dead Band 2%
Output Contacts 1 - SPDT 1 - SPST (N.O.)
Contact Rating 5A at 240VAC resistive
Expected Relay Life Mech: 10 million operations
Elec: 100,000 at rated load
Operating Temp - 40º to 131º F
Humidity Tolerance 97% w/o condensation
Enclosure Material ABS plastic
Mounting 8-pin socket (*order separately)
Weight 5 oz.
*Order 8-pin socket number 51X120
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