Static Transfer Switches
TwinSource
DCC-III RMSTS
DCC-III is a three-phase, four-pole rack-mount static transfer switch for giving high-power single-corded rack equipment two sources. Four-pole switching disconnects and reconnects source neutrals in three-phase, four-wire applications. The solid-state SCR design transfers in one-quarter cycle at any source phase angle. The 4U unit is rated 50 A at 208/120 V, 18 kW, with 22 kA short-circuit withstand and a 33-inch chassis depth.
Product details
Key features
- Four-pole switching disconnects both source neutrals
- Solid-state SCR transfer at any source phase angle
- Plug-in electronic module works with an internal maintenance bypass
- Redundant logic power supplies and cooling fans
Key specs
- Type
- Three-phase 4-pole rack-mount static transfer switch (RMSTS)
- Current rating
- 50 A
- Voltage and power
- 208/120 V, 18 kW, 3-phase 4-wire
- Frequency
- 50/60 Hz
- Poles
- 4 (avoids ground circulating currents)
- Sense and transfer time
- 1/4 cycle
- Short circuit withstand
- 22 kA
- Module
- Plug-in hot-swappable electronic module; internal maintenance bypass
- Redundancy
- Redundant logic power supplies and redundant fans
- MTBF (manufacturer stated)
- Calculated > 1 million hours; predicted > 60 million hours
- MTTR (manufacturer stated)
- < 2 minutes
- Form factor
- H 7 in, W 19 in, D 33 in
- Weight
- 65 lb / 30 kg; requires a rack shelf to support the weight
- Operating temperature
- 0 to 40 °C, 0 to 95% RH non-condensing
- Standards
- TUV certified to UL 1008 and CSA
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