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Frequently Asked Questions (FAQ)

The following are answers to common questions. If you have a question that you do not see listed below, please do not hesitate to contact us by calling 800-780-4324 x311

You may also Ask a Question online. And we might add your question to this list.

[+] Click on the questions below to reveal the answers.


Can 50 Amp models be operated on a 120V/30 Amp, 120V/20 Amp or 120V/15 Amp power source?

Yes, in most cases, purchased RV adapter cord sets can be used with your Surge Guard products. Note that the adapter must be configured to supply power to both input lines of the 120/240V, 50A Surge Guard. Also, the power source should be protected by a properly rated circuit breaker, so the adapter cord is not overloaded.


The unit “hums” when operating, is this dangerous?

Typically this is a normal electrical phenomenon caused when the contactor coil “vibrates”. Check to see if other symptoms are present (i.e. signs of overheating or erratic power). Try removing and restoring power to the unit several times. The supplier of the contactor indicates this condition often will subside with continued operation. If the condition persists or other symptoms are observed, contact the manufacturer for instructions by calling 1-800-780-4324 x 311.


How is Surge Guard different from a voltage booster?

Voltage boosters are only able to correct for minor out of specification low voltages and provide only limited surge protection for itself and not for the coach.  Voltage boosters offer no protection for extreme over/under voltage and open neutral condition.


Is it safe to switch to the bypass mode?

Some discontinued models do provide a bypass function.  We have since removed it from all our products for safety reasons. Bypass mode is for emergency use only in a high/low voltage situation.  There is no protection for over/under voltage and open neutral when in bypass mode.


What should be in line first, the voltage booster or the Surge Guard?

We recommend that the voltage booster be first, then the Surge Guard.


Why has my Surge Guard unit failed? (see troubleshooting instructions, and get help as needed)

1) Surge Guard unit components will sometimes fail during "normal" operation, for no apparent or obvious reason, rendering the Surge Guard inoperative. 2) Surge Guard unit components will sometimes fail when subjected to excessive temperatures, input voltages or surges that might otherwise result in damage to electrical/electronics equipment in the coach. In this event, even though the Surge Guard is rendered inoperative, it will likely have protected your expensive equipment in the coach from damage.


What are the approximate dimensions for the hardwire units?

34520 — 6” W x 12” L x 5” D (with key), 4” D (without key)
34560 — 6” W x 12” L x 6” D (with key), 5” D (without key)
40240 — 6” W x 13” L x 6” D
40250 — 9” W x 15 1/4” L x 5 1/2” D
41250 — 9” W x 13” L x 5 1/2” D
41260 — 9” W x 13” L x 5 1/2” D
41290 — 12 3/8” W x 16 3/8” L x 6 1/8” D


Can I install the hardwire Surge Guard unit myself?

The manufacturer recommends that the unit be installed by a qualified licensed electrician.   However, as long as the unit is properly installed warranty is still valid.  For all units, the manufacturer recommends that initial power be applied to the Surge Guard with the coach disconnected.  If the Surge Guard operates normally, remove power and carefully connect the remaining load wires.  Apply power for normal operation.


Can the hardwire units be mounted horizontally?

The manufacturer recommends mounting the unit any way other than flat where the label is facing the sky. Vertically or horizontally upside down (label facing the earth) is advised.


What does the "Caution When Illuminated" light mean?

A potentially dangerous condition exists.  Disconnect/remove power and verify that power to the unit (from the power source) is not miswired.  If the unit is properly wired, it may not be adequately grounded, causing the CAUTION WHEN ILLUMINATED light to be on.


Why does the Over/Under Voltage light blink for 2 minutes 16 seconds when the unit is first connected and power is applied or reapplied?

This is normal.  When the blinking light goes out after blinking for 2 minutes, 16 seconds, power is available for the coach.  The Over/Under voltage light is not lit during normal operation.


My unit makes a single large “clunk” 2 minutes, 16 seconds after power is applied (or when switched to bypass mode). Should I be concerned?

This is a normal sound and is caused by the power contactor (relay) inside the unit energizing. This indicates "normal" power is available to the RV.


What do I do when the unit "chatters" when power up is attempted?

DO NOT ATTEMPT TO OPERATE. Consult the troubleshooting guide and/or call TRC technical support at (800) 780-4324 x 311.


What do I do if the unit fails to operate?

With Line Light(s) Off:
Check power source.  On 50 Amp units, both line lights must be on for the unit to operate.
With Lines Light(s) On:
If the condition persists, verify that the line (source) voltage is within 102V to 132V per line.  If line voltage is within 102V to 132V per line (both lines must be within tolerance), return unit to manufacturer.  Call 1-800-780-4324 x 311 for return instructions.


Can these units be “field repaired”?

No. The unit must be returned to TRC.  Please call 1-800-780-4324 x 311 to obtain a return materials authorization number.


Can these units be “field tested”?

No.  However, please consult the troubleshooting guide shipped with each product, or at www.surgeguard.com under the given part number.  If unit needs to be returned, please contact TRC at 1-800-780-4324 x 311 to obtain a return materials authorization number.


What is Surge Protection?

Surge protection is protection against voltage spikes on power lines.  These voltage spikes can cause severe damage to electronic/electrical equipment, even if not in close proximity.  Although several factors determine the effectiveness of surge protection, a loose guide is the number of joules rated for the device.  This should not be confused with over/under voltage protection, which is effective for a gradual increase or decrease in voltage, exceeding the maximum or minimum voltage for which appliances are rated.
NOTE: Direct lightning strikes can be catastrophic.  Although effectiveness varies, obviously no device can effectively protect against a close or direct lightning strike.


How is Surge Guard different from standard surge protectors?

Standard surge protectors do not provide protection for over/under voltage or open neutral conditions.


How do I know my surge protection still works?

The surge protection does not usually fail unless there is a direct lightning strike.  If this happens, there would likely be other obvious damage; otherwise, the surge protection should last indefinitely.


What is Over Voltage and Under Voltage Protection?

Over voltage and under voltage protection removes primary power from the load (i.e. RV Coach) when the voltage drops below 102V or above 132V (safe mode).  This predetermined value is selected as the point beyond which electrical and electronic equipment is likely to be damaged if operated for an extended length of time.  The user of any protective device is urged to be aware that protective devices are not necessarily effective for all circumstances.  Bypassing for this condition can result in damage of electrical equipment on the coach.


What is the warranty period for these units?

Refer to the warranty information supplied at time of purchase.  Generally, unless otherwise noted, the unit is under warranty for one (1) year with proof of purchase.


Are locking devices available to protect my portable Surge Guard unit?

Yes, a lock hasp (for use with a padlock) can be obtained through Surge Guard dealers nationwide.


For Additional Technical Support

For additional technical support please contact TRC Monday through Friday, 8:00 am to 5:00 pm EST 1-800-780-4324 x 311


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