53A-353 Relay Switching Card
• 24 independently controllable SPST switches
• Selectable maximum operating speed of 20 or 100 operations per second
• Maximum switching current of 4A at 20 operations per second
The 53A-353 Relay Switching Card provides twenty-four independently controllable single-pole, single-throw relays. The relays can be switched at up to 100 times per second while providing a minimum dwell time of four milliseconds. Fully random relay control (open or close) is provided by means of ASCII characters transmitted from the system controller.
Built-In-Test Equipment (“BITE”) is provided by a readback feature which allows the user to interrogate individual channels under software control to determine closure status. In addition, a row of LED indicators along the front edge of the Card shows which relays are open and which are closed.
24 single-pole, single-throw relays.
Maximum Switching Power, 1000 VA ac, 192W dc.
Maximum Switching Voltage, 250V ac, 48V dc.
Maximum Switching Current 4A (less than 20 Operations per min).
Maximum Operating Speed:
20 or 100 operations/sec, selectable.
Dwell time at maximum switching rate is 4 msec minimum. Other dwell times must be set in software.
Single-line Thermal Offset, less than 10 microvolts.
Initial Signal Path Resistance, less than 300 milliohms.
Resistance at End of Life Load Life, less than 350 milliohms.
Insulation Resistance, greater than ten gigohms between all insulated parts.