SPECIFICATIONS
MODEL B158B 158B A158B EX158B
Input Voltage 120vac 208/240vac 480vac 380vac
Adjustment Range 85-125vac 160-260vac 380-500vac 300-400vac
Frequency 60 Hz 60 Hz 60 Hz 50 Hz
Power Consumption
(per phase)
.25 W .5 W 1.5 W 1.25 W
Transient Protection 2500 VRMS of 10 msecs
Repeat Accuracy ± 0.1% of setpoint (fixed conditions)
Response Time 0.5 seconds
Reset Time Short cycle restart delay - 2 seconds
“R” versions - 5 minutes
Reset Type Automatic
Dead Band 2%
Output contacts SPDT 10A at 240vac resistive
Expected Relay Life Mech: 10 million operations
Elec: 100,000 operations at rated load
Operating Temp -40° to +131° F
Humidity Tolerance 97% w/o condensation
Enclosure Material ABS plastic
Mounting Surface
Weight 5 oz.
ADDITIONAL ORDERING INFO:
add an “R” to any 158 model number above, for the 5 minute time delay option
DESCRIPTION
The Model 158 continuously monitors 3-phase power lines for
abnormal conditions. When properly adjusted, the Model 158
monitor 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 electro-mechanical relay. 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 monitor will automatically
reset.
The Model 158 does not require a neutral connection, and
can be used with Wye or Delta systems. Four versions cover
120V, 208/240V, 480V (60 Hz) and 380V (50 Hz). Voltage
ranges are sufficient to allow for proper adjustment to existing
conditions. A front-mounted LED failure indicator is provided.
The “R” versions of the Model 158 Monitor have an additional
LED indicator for RESTART, and a 5 minute short cycle
timer, to delay restarting the motor.
2.66"
1.25"
3.9"
.76"
.95"
3.2"
A
B
C
NO
NC
C
2.19"
.23"
3.65"
.30" x .19"
1.79"
DIMENSIONS
MODEL 158
MODEL 158R
3-Phase Monitor
ll Surface-mount for HVAC Applications
ll Optional 5 Minute Short Cycle Time Delay
ll Detect Phase Loss, Low Voltage, Phase Reversal
ll 5 Year Unconditional Warranty
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. 87A254 03/02
© 2002 TIME MARK CORPORATION
11440 East Pine Street
Tulsa, Oklahoma 74116
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