Transfer Switch
Page 4 of 16 Pages
2.0 Specifications and Certifications
Specifications
Switch Mechanism Solenoid Actuation
Short Circuit Ratings of Transfer Switches
100 A
200 A
260, 400, 600 A
800, 1000, 1250 A
RMS Symmetrical Amperes
42,000
50,000 When protected by
65,000 a circuit breaker.
85,000
Control Voltage 120 VAC
Pick-up Voltage 90% of normal source voltage
90% of emergency source voltage
Drop-out Voltage 84% of normal source voltage
84% of emergency source voltage
Auxiliary Contacts 10 A, 125/250 VAC
Note
Time delay settings and voltage pick-up and drop-out levels are set at the factory and should not be
changed without consulting the factory.
Certifications
Hubbell’s Automatic transfer switches meet the requirements for all of the certifications listed below.
UL 1008 Standard for Safety for automatic transfer
switches
NEC Article 517, Health Care facilities
NEC Article 702, Optional Standby Systems
NEC Article 701, Legally Required Standby
Systems (LX-450 only)
NFPA 20 Installation of Fire Pumps
3.0 Installation
Refer to the transfer switch nameplate to ensure that the voltage, current, and horsepower ratings are
compatible with the load.
Refer to the receiving, handling, storage, installation, and inspection procedures in the Instruction
Manual that accompanies the combination Fire Pump Controller and automatic transfer switch. Many of
the procedures in the installation section are applicable to the automatic transfer switch in the adjoining
cabinet. For automatic transfer switches sold as an individual unit, and for additional information,
follow the procedures below.
