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CTSM and CTGM Series Manual Transfer Switches

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Some emergency power installations require multiple automatic transfer switches, each feeding a specific load. In many installations where noncritical loads are being served, specifications may call for manual or non-automatic transfer switches. This method is used because operating personnel are present and the loads are not of a critical nature requiring unattended automatic operation.

Because of the less critical function of this equipment, no specific industry requirements have been established. As a result, devices such as double throw disconnect switches have been used. Since the non-automatic transfer switches are part of the emergency power supply system, they should have the same UL 1008 electrical ratings as the automatic transfer switches feeding the more critical loads. In the event of a short circuit, the non-automatic transfer switches must have the same withstand current ratings as the automatic transfer switches and they must be as rugged and dependable.

To meet this need, Caterpillar offers the CTSM and CTGM Series electrically operated, mechanically held non-automatic transfer switches. These units feature the same construction as the CTS Series of automatic transfer switches and are supplied with the same electrical ratings and mechanical features. The manual series is electrically operated by means of push buttons mounted on the switch enclosure or at a remote location. Unlike the above mentioned disconnect switches, the CTSM and CTGM Series offer additional protection by incorporating normal and alternate source voltage sensing relays which will not permit the switch to be manually transferred unless the source to which it is being transferred is at 90% of its rated voltage.In addition, the CTSM and CTGM Series are tested and listed per UL 1008 standards. Double throw disconnect switches are not listed to this critical standard.
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Overview

Some emergency power installations require multiple automatic transfer switches, each feeding a specific load. In many installations where noncritical loads are being served, specifications may call for manual or non-automatic transfer switches. This method is used because operating personnel are present and the loads are not of a critical nature requiring unattended automatic operation.
Because of the less critical function of this equipment, no specific industry requirements have been established. As a result, devices such as double throw disconnect switches have been used. Since the non-automatic transfer switches are part of the emergency power supply system, they should have the same UL 1008 electrical ratings as the automatic transfer switches feeding the more critical loads. In the event of a short circuit, the non-automatic transfer switches must have the same withstand current ratings as the automatic transfer switches and they must be as rugged and dependable.

Technical Summary

Units:
Rating Range 40-4000A 40-4000A Less
Transfer Type Open / Manual Open / Manual Less
Switch Type Contactor Based Contactor Based Less

CTSM and CTGM Series Manual Transfer Switches Standard Equipment

Standard Accessories
  • A - Auxiliary Contacts:
  • L Indicating LED Pilot Lights:
  • YE Pushbutton to emergenc
  • YN Pushbutton to normal

Key features

Suggested Specifications


Please refer to Caterpillar’s complete series of transfer switch specifications for your exact configuration. The following is a suggested addendum to those guide specs.

The manual (non-automatic) transfer switch(es)shall be of the same electrical ratings, withstand current ratings and main contact construction as the automatic transfer switch(es).

Switch(es) shall be _________ amp, _________ volt,_________ poles as indicated on the drawings.

Accessory features shall include: (refer to list on previous page). Switch(es) shall be UL 1008 listed and shall be Caterpillar CTSM Series (or CTGM as applicable) or approved equal.

Many additional accessories are available to meet installation requirements. Contact your Cat dealer with your project needs.

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