Repair
Repair Price: $ 1,108.00
Purchase
CSL Part Number: 70776
Product Overview: The Square D Life-Gard Model 85A (also known as H80) is a transformer temperature controller designed to protect power transformers by monitoring winding temperature and automatically controlling cooling fans. It uses resistive temperature detectors (RTDs) to measure transformer temperature, activating fans at programmable setpoints (typically around 110°C) and triggering alarms at higher thresholds (typically 125°C) to prevent overheating. The unit features a digital display, tactile buttons for configuration, and relay outputs for fan control and alarm signaling, commonly used in electrical substations and industrial power distribution systems.
Category: Temperature Control
Manufacturer: Square D
Alternate Manufacturer Names: Life-Guard, lifegard, Schneider Electric
Manufacturer Part Number: 85A / H80
Series: Model 85A Transformer Fan Control
Brand: Life-Gard
Other Synonyms: Life-Guard, lifegard, Schneider Electric
Why replace your Life-Gard Fan Control System? Repair it at 1/4 the cost!
Common Failures
Frequently observed issues in this product include worn buttons, faulty displays, persistent alarms, broken transformer legs, and defective capacitors. These defects can cause improper device functioning, including inconsistent voltage outputs, relay chatter, and abnormal operation.
Repair Approach
Repairs typically involve replacing defective components such as capacitors, relays, and card edge guides. Button overlays are often restored using labeling tape. Damaged transformer legs are repaired by resoldering. In some cases, malfunctioning components like transistors and memory chips are replaced to restore correct operation.
Testing & Quality
After repair, units undergo testing to verify functionality. This includes burn-in tests using load simulations to verify operational stability. The units are also tested according to established procedures to confirm that functions such as fan and alarm outputs respond correctly to temperature changes. Repairs are further validated through quality assurance processes.
Service and repair your broken Square D part
We can repair your Square D model 85A / H80 in our facility. Let our skilled technicians get your Square D back in operation quickly.
Step 1 - Click the green 'Repair Now' button above to add the part and then complete the RMA.
Step 2 - The RMA form will be sent to you via email. Print the RMA form and put it in a box with the item(s) for repair.
Step 3 - Ship or mail the box to the address listed on the RMA.
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