Types of Rack-Mount Transfer Switches Offered By TwinSource

TwinSource offers two types of rack mount transfer switches for two applications. The two technologies can be used side by side for applications requiring different levels of reliability at the same data center.

The most critical applications would use our rack-mount automatic static transfer switch (RMSTS), and the less critical ones would use our electromechanical rackmounted automatic transfer switch (RMATS). “Static” is also referred to as “solid state.” Both offer benefits best suited to the specific application. These applications are:

A) For highly mission critical applications where the cost of each outage is substantial and a Mean Time Between Failures (MTBF) in excess of 20M hours is expected we recommend our RMSTS (rack mount static transfer switch) - These are in use at many major data centers where each outage can cost hundreds of thousands to millions of dollars, as well as at process control applications where an outage can affect an entire manufacturing or power plant’s production capability (which can also add up to millions in losses). For these applications we offer our DCC-II Dual Cord Converter Rack-Mount Static Transfer Switch (RMSTS). They are 2 pole solid state SCR based full featured static transfer switches in current ratings of 30A, 40A, and 50A at voltages of 100V, 120V, 208V, 220V, 230V, and 240V in 50Hz and 60Hz for worldwide use. Main features are:

1. Super Fast (1/4 cycle) SCR Based Static Transfer Switch for high availability mission critical applications with a high fault (22KA) rating that is certified to UL1008 Standards.
2. Transfers for all phase angle differences between sources.
3. MTBF > 20 million hours.
4. Continuous Duty 100% rated (i.e., a 30A switch is rated for 30A continuous and not just 24A at 80%).
5. Certified to UL1008 for Static Transfer Switch Standards. CE Labeled for international use.
6. 4U high construction with a Plug-in Electronic Module (EM) that plugs into an outer Built-in Bypass Isolation Module (BM) with a 7 Position Bypass Isolation Selector.
7. Built-in Voltage Suppression & Transient Protection to protect internal electronics.
8. Completely user settable and configurable.
9. Two isolated voltage-free summary alarm contacts.
10. Optional Modbus RTU RS 485 Interface to connect to your Building Management System (BMS) for monitoring of all status and alarms.
11. Optional Ethernet Translator Unit (ETU) for stand alone LAN/Web based monitoring of all status and alarms - can acknowledge alarms and records and archives data, allows remote preferred source selection, reports power quality at all racks for both sources, allows for independent monitoring and archiving away from the BMS if monitoring by the BMS is excessively costly.
12. Optional Interlocks to prevent removal of the Electronic Module before Bypass Selector is in bypass isolate position and to not allow movement of selector if the EM has not been placed back into the unit after a maintenance action.

For a Word document of detailed purchase specifications, please contact us. Download Data Sheet (PDF)

B) For less critical applications where cost is a major consideration and the user is satisfied with an electromechanical type automatic transfer switch we offer our DCC-I Dual Cord Converter Rack-Mount Automatic Transfer Switch. They are 2 pole, electromechanical rackmounted automatic transfer switches (RMATS) in current ratings of 20A and 30A, at voltages of 100V, 120V, 208V, 220V, 230V, and 240V in 50Hz and 60Hz for worldwide use. Main features are:

1. Fast Transfer (1/2 to 1 cycle for in-phase sources) electromechanical design as a cost effective solution for a basic transfer switch, rated at 22KA with upstream protective devices.
2. Transfers for all phase angle differences between sources.
3. MTBF > 500,000 hours.
4. Continuous Duty 100% rated (i.e., a 30A switch is rated for 30A continuous and not just 24A at 80%).
5. Certified to meet IEC 60950 Standards for both domestic and international use.
6. 1U high construction (without bypass).
7. Built-in Voltage Suppression & Transient Protection to protect internal electronics.
8. Completely user settable and configurable.
9. Optional Modbus RTU RS 485 Interface to connect to your Building Management System (BMS) for monitoring of all status and alarms.

For a Word document of detailed purchase specifications, please contact us.

[Photos of typical sites where rack-mounted static transfer switches are used due to criticality of their operations.]