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ENGINEERING SPECIFICATION
SYMCOM MODEL 250A / 250-100 / 250-600 3-PHASE VOLTAGE MONITOR/PROTECTION RELAY
PART 1 GENERAL
1.1 REFERENCES
A. UL 508 Industrial Control Equipment – Underwriters Laboratories
1.2 WARRANTY
A. Manufacturer Warranty: The manufacturer shall guarantee the equipment to be free from material and workmanship defects for a
period of five years from the date of manufacture when installed and operated according to the manufacturer’s requirements.
PART 2 PRODUCTS
2.1 MANUFACTURERS
For Model 250A
The equipment specified shall be the Model 250A, manufactured by SymCom, Inc.
For Model 250-100
The equipment specified shall be the Model 250-100, manufactured by SymCom, Inc.
For Model 250-600
The equipment specified shall be the Model 250-600, manufactured by SymCom, Inc.
2.2 DESCRIPTION
A. Regulatory Requirements:
1. The equipment shall be UL Listed as type NKCR—Industrial Control Equipment-Motor Controllers-Auxiliary Devices.
2. The equipment shall be ULC Listed as type NKCR7—Industrial Control Equipment-Motor Controllers-Auxiliary Devices
2.3 PERFORMANCE/DESIGN CRITERIA: 3-PHASE VOLTAGE MONITOR/PROTECTION RELAY
*Using the adjustable restart delay to increase time before restart after a fault.
Certified for Canada.
A. Protective Relay Functions
1. The voltage monitor shall provide protection against the following conditions:
a. phase loss (single phasing)
b. phase reversal
c. low voltage
d. high voltage
e. voltage unbalance
f. rapid cycling due to power faults*
B. Capabilities and Features
1. Inputs
For Model 250A
a. The equipment shall accept a 3-phase input voltage range 190-480VAC, adjustable.
For Model 250-100
a. The equipment shall accept a 3-phase input voltage range 95-120VAC, adjustable.
For Model 250-600
a. The equipment shall accept a 3-phase input voltage range 475-600VAC, adjustable.
For All Models
b. The equipment shall accept 3-phase input voltage at 50/60 Hz.
2. Outputs
a. The equipment shall include two Form C (DPDT) output relays. Contacts pilot duty rated 480VA@240VAC. Contacts
general purpose rated 10A@240VAC.
3. The equipment shall include:
a. a low voltage trip point of 90% of nominal voltage setting
b. a high voltage trip point of 110% of nominal voltage setting
c. a phase unbalance trip point of 6%
d. a trip delay of 4 seconds for high/low voltage; a trip delay of 2 seconds for unbalance & phasing faults
e. a manual reset, standard with adjustable restart delay of 2–300 seconds
f. voltage accuracy ±1%
4. The equipment s hall have an indicator light. The light scheme shall have the capability to indicate whether the phase monito r
is in run mode, restart delay mode, or fault mode. Fault modes shall be high/low voltage, unbalance/single phase and phase
reversal.
C. Electromagnetic Compatibility
1. The equipment shall be immune to electrical surges per IEC 61000-4-5. Specified limits shall be ±6kV line-to-line and line-toground.
ES-250A_A1 4/6/2010
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2. The equipment shall be immune to electrical fast transient bursts exceeding IEC 61000-4-4, Level 3. Specified limits shall be
4kV input power, 2kV inputs/outputs.
3. The equipment shall be immune to electrostatic discharge per IEC 61000-4-2, Level 3, 6kV contact discharge and 8kV air
discharge.
D. Dielectric Isolation: Equipment withstands an alter nating current potential of 1000V plus twice the rated voltage of the equipment
for 1 minute without breakdown between uninsulated live parts and the enclosure with the contacts open and closed; between
terminals of opposite polarity with the contacts closed; and between uninsulated live parts of different circuits.
E. Environmental Requirements
1. The equipment shall operate continuously without derating in ambient temperatures of -40° to 70°C (-40° to 158°F).
2. The equipment shall operate continuously without derating in relative humidity of up to 95% non-condensing per IEC 68-2-3.
3. The equipment shall operate properly after storage in ambient temperatures of -40° to 80°C (-40° to 176°F).
F. Dimensions: The equipment dimensions shall not exceed 2.90” high X 5.25” wide X 2.913” deep.
G. Mounting:
1. The equipment shall be surface mountable.
End of Section
ES-250A_A1 4/6/2010
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