ENGINEERING SPECIFICATION
SYMCOM MODEL ALT-24-S, ALT-24-S-SW Alternating Relay
PART 1 GENERAL
1 .1 REFERENCES
A. IEC 60947 Low Voltage Switchgear and Controlgear – International Electrotechnical Commission
B. ANSI/IEEE C62.41 – American National Standards Institute/Institute of Electrical & Electronics Engineers
1 .2 WARRANTY
A. Manufacturer Warranty: The manufacturer shall guarantee the equipment to be free from material and workmanship defects for a
PART 2 PRODUCTS
2 .1 MANUFACTURERS
2 .2 DESCRIPTION
2 .3 PERFORMANCE/DESIGN CRITERIA: SINGLE-PHASE ALTERNATING RELAY
period of five years from the date of manufacture when installed and operated according to the manufacturer’s requirements.
For Model ALT-24-S
T he equipment specified shall be the Model ALT-24-S, manufactured by SymCom, Inc.
For Model ALT-24-S-SW
The equipment specified shall be the Model ALT-24-S-SW, manufactured by SymCom, Inc.
A. The equipment shall be an alternating relay with the characteristics described below.
A. Capabilities and Features:
1. Inputs
a. The equipment shall provide one control input.
b. The equipment shall accept single-phase input voltage rated 20-26 VAC or VDC.
2. Outputs
a. The equipment shall include one SPDT output relay contact pilot duty rated at 480VA @ 240VAC.
3. Functional Specifications
a. The equipment shall provide alternating logic.
1) The equipment shall energize load 1 upon power up.
2) The equipment shall alternate loads as determined b y the control input/pilot device.
b. The equipment shall have two indicator LEDs capable of indicating the status of the output relay.
For the –SW option
c. The equipment shall provide the following functions controlled from a dial or switch:
1) Force load 1: only load 1 will be allowed to operate.
2) Force load 2: only load 2 will be allowed to operate.
3) Automatic: normal alternation between load 1 and load 2.
B . Electromagnetic Compatibility:
1. The equipment shall be immune to electrostatic discharge per IEC 61000-4-2, Level 2, 4kV contact discharge and 4kV air
discharge.
2. The equipment shall be immune to electrical fast transient bursts per IEC 61000-4-4, Level 3. Specified limits shall be 2kV
power supply port, 1kV input/output ports.
3. The equipment’s power supply port shall be immune to electrical surges per IEC 61000-4-5, Level 3. Specified limits shall be
2kV line-to-line and line-to-ground.
4. The equipment shall be immune to radiated radio frequency emissions. Specified limits shall be 10V/m at 150 MHz.
C. Dielectric Isolation: Equipment withstands an alternating 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.
D . Environmental Requirements:
5. The equipment shall operate continuously without derating in ambient temperatures of -20° to 50°C (-4° to 122°F).
6. The equipment shall operate continuously without derating in relative humidity of up to 95% non-condensing per IEC 68-2-3.
7. The equipment shall operate properly after storage in ambient temperatures of -40° to 80°C (-40° to 176°F).
E. Dimensions: The equipment dimensions shall not exceed 1.750” H x 2.375” W x 4.125” D (with socket).
F . Mounting:
8. The equipment shall be mounted using the SymCom OT08-PC 8-pin Socket.
a. The socket shall be 600V rated.
b. The socket shall be 10A rated.
c. The socket shall provide a means for mounting on the surface or on a DIN rail.
End of Section
ES-ALT-24-S_A1 12/2009
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