Datasheet

www.symcom.com • 800-843-8848 • fax: [phone]
26
Available Models:
Features:
• Standard high voltage relay for 400V and
600V ranges
• Multiple LEDs provide diagnostics
• Adjustable trip and restart delays
A pprovals:
Specications
355-200
355-400
355-400-5
355-600
The Model 355
is a 3-phase voltage monitor with adjustable trip
and restart delay, adjustable voltage unbalance
and multiple diagnostic lights.It is perfect for
heavy-duty applications that need both protection
and simple user-friendly diagnostics. Applications
include pump panels, commercial HVAC, oil rigs
and others.
The Model 355 uses microcontroller technology
to monitor incoming voltage and de-energize
its output relay if power problems exist. The
Model 355 can protect motors from damage
caused by single-phasing, high and low voltage,
phase reversal and voltage unbalance. It has four
diagnostic LEDs that clearly show overvoltage,
undervoltage, voltage unbalance, reverse-phase
and normal conditions.
The Model 355-200 is equipped with a heavy-duty
10A general purpose SPDT relay. The Model 355-
400 and 355-600 are equipped with a 470VA @
600VAC pilot duty SPDT relay. A high voltage
(600V) DPDT relay output option is available with
the 400V model.
For more information see:
See Appendix A, page 68, Figure 7 for dimensional
drawing.
See Appendix B, page 75, Figures 21 & 22 for typical
wiring diagrams.
Option
5 - DPDT Relay
Model 355
3-phase voltage/phase monitor, panel mount, adjustable trip/restart delays & voltage unbalance
percentage, optional 2 each 480V-rated relays
3-Phase Voltage Monitor
SPDT (355-400, 355-600)
Pilot Duty .....................................470VA @ 600VAC
DPDT (-5 Option)
Pilot Duty ......................................
470VA @ 600VAC
General Characteristics
Temperature Range
Operating .....................................-40° to 70°C (-40° to 158°F)
Storage ........................................-40° to 80°C (-40° to 176°F)
Repeat Accuracy
Fixed Conditions ...............................±0.1%
Maximum Input Power .........................6 W
Terminal
Torque ........................................7 in.-lbs.
Wire Size ......................................12-18AWG
Transient Protection (Internal) ...................2500V for 10 ms
Safety Marks
UL ............................................UL508 (File #E68520)
Dimensions ....................................2.93”H x 5.27”W x 2.95”D
(74.4 x 133.9 x 74.9mm)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.94 lb. (15.04 oz., 426.38 g)
Mounting Method ..............................#8 screws
Special Options
Option 5 - DPDT Relay
*Note: 50Hz will increase all delay times by 20%.
Input Characteristics
Line Voltage
355-200 ........................................190-240VAC
355-400 ........................................380-480VAC
355-600 ........................................475-600VAC
(Specify voltage range)
Frequency .....................................50*/60Hz
Functional Characteristics
Low Voltage (% of setpoint)
Trip ...........................................90% ±1%
Reset ..........................................93% ±1%
High Voltage (% of setpoint)
Trip ...........................................110% ±1%
Reset ..........................................107% ±1%
Voltage Unbalance (NEMA)
Trip ...........................................2-8% adjustable
Reset ..........................................Trip setting minus 1%
Trip Delay Time
Low & High Voltage and Unbalance ..............2-30 seconds adjustable
Single-phasing Faults (>25% UB) .................2 seconds
Restart Delay Time
After a Fault or Power Loss ......................Manual, 2-300 seconds adj.
Output Characteristics
Output Contact Rating
SPDT (355-200)
Pilot Duty .....................................480VA at 240VAC
General Purpose ................................10A
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