The Astronics / EADS / Racal 1260-120 is a 20-channel Single Pole Single Throw (SPST) power switch plug-in module designed for high-current switching applications handling both AC and DC power. This module employs the standard Adapt-a-Switch plug-in design for seamless integration and field replacement in compatible chassis. It delivers switching capability up to 125 VDC or 250 VAC at currents reaching 10 ADC or 13 AAC, with maximum switching power of 300 W (DC) or 200 VA (AC). The 1260-120 integrates into VXI, GPIB/RS-232, and LXI switching systems, offering flexible connectivity for diverse test and measurement applications.
Path resistance measures less than 200 mΩ initially, while insulation resistance reaches 10⁹ Ω. AC performance into 50 Ω includes small-signal bandwidth to 50 MHz and power bandwidth to 400 Hz. Channel-to-chassis capacitance is below 10 pF, with open-channel capacitance under 200 pF. The module operates from a +5 VDC supply drawing 150 mA (module) plus 40 mA per energized relay up to 1 A maximum. Switching time is less than 10 ms including settling. An external Emergency Reset interface allows immediate opening of all channels for safety-critical operations.
Mechanical durability is verified by 10,000,000 rated mechanical operations and 100,000 electrical operations at full rated load. MTBF reaches 979,058 hours per MIL-HDBK-217E. The module operates across 0 °C to 55 °C and survives 30 g / 11 ms half-sine shock and 0.013 in peak-peak vibration from 5 to 55 Hz. Environmental specifications include 85% ±5% relative humidity non-condensing and 10,000 ft operating altitude. Compliance covers EN55011A emissions, IEC801-2/3/4 immunity, and EN61010-1 safety standards. Weight is 13 oz with dimensions of 4.5″ H × 0.75″ W × 9.5″ D; the module interfaces via 20-pin rack and panel connector and installs into Racal Instruments™ 126 carriers.
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