The Surgistor Series Surge Protection System

Application

The Surgistor Series of surge protectors are designed for use on AC or DC systems. Primary applications would be the protection of sensitive electronic equipment used in the remote monitoring or interruption of rectifier systems and the protection of the rectifier itself. The protector is designed for connection to the anode /cathode terminals and ground, and to the AC mains and ground. Two Surgistors offer affordable protection to both the input and output of a rectifier system.

Method of Operation

When a surge or transient exceeds the operational voltage of the Surgistor, the surge is bypassed to ground. This protection continues until the surge voltage reduces below the threshold of the Surgistor. The protection system resumes normal operation after the surge passes without interrupting either the input or output power. The symmetrical design of the Surgistor clamps surges equally between any two leads. This maintains all potentials to a safe level.

Installation

Installation has been eased by the symmetrical construction of the Surgistor. The technician doing the installation only needs to connect the three wires of the Surgistor to the appropriate terminals. For the most effective use, the wire lengths of the Surgistor should be trimmed as short as is reasonable for the installation. In other words, there should be no excess wire! Do not coil excess wire, remove it. Coiled wire acts as an inductor and lowers the effective clamping action of the Surgistor. Before installation, determine a suitable location for placement of the Surgistor within the system to be protected. This position should not be subject to temperatures in excess of 65 degrees C. A standard one-inch threaded fitting with nut is provided as a means of mounting, if desirable. The best position in the one that requires the least lead length.

Anode/Cathode, Ground Connection

Observe rectifier current before turning off, then turn off. With the rectifier turned off and the Surgistor placed in what has been determined as a suitable position, take one of the three leads and bring it over to the ground connection. Allow about two to three inches of slack in the wire and cut the remainder off. Trim the insulation back about one-half inch, select a crimp connector and crimp. Bolt the wire to the ground clamp. repeat this procedure for the Anode and then the Cathode connection. Turn power on and observe that the rectifier current is the same. If the current is not the same turn off power immediately and check all connections. Turn power on again. If the current is too high, remove the Anode/Cathode connection and try again. If the current returns to normal, the Surgistor may be defective, return it for a replacement. If the current remains high after removal of Anode and Cathode connections, check for other causes. Reinstall the Anode/Cathode connections after determining the problem. Check system current once again.

AC Mains, Ground Connection

Turn off the AC power to the rectifier. Following the connection procedure outlined in the Anode/ Cathode Ground Connection, connect ground, Hot and Neutral. Verify connections are tight and no shorts are present. Turn on AC power. Wait about one minute then feel the Surgistor. If the Surgistor feels warm, remove it and return it to M. C. Miller Co,. Inc. as it may be defective. For 220VAC or less systems the SURG20 needs to be used.

Electrical Specifications
	SURG20
Clamp Voltage:	275VAC; 275VDC
Surge Current:	64,000 A 8/20uS wave
Energy Absorption:	1208 Joule (Watt Seconds)
Tolerance:	+/- 10%
Temperature:	-40 degrees C to +75 degrees C

Physical Specifications
	SURG20
Height:	3.5"
Diameter:	3.75"
Weight:	8.0 oz.
Wire:	3 feet each X 3, 10 gauge stranded, 600V insulation

Hermetically sealed construction can withstand indefinite immersion in water.
All units supplied with mounting hardware and crimp connectors.