
WHAT IS IT?
The Sentry 3N1 combines three important equipment protection functions into one easy-to-use pre-wired solution.
SURGE PROTECTION + VOLTAGE MONITORING + DISCONNECT
Designed for residential and commercial single-phase 208/240VAC HVAC/R equipment.
THREE THINGS TO REMEMBER

WHY SENTRY 3N1?
- Protect More – Surge protection alone doesn’t address every potentially damaging condition.
- Simplify the Install – Three important functions are integrated into one pre-wired solution.
- Help Diagnose – The digital line voltage monitor and 50-fault history provides technicians with useful information about power conditions.
- Service, Don’t Just Replace – Modular components are field replaceable.
KNOW THE DIFFERENCE

Sentry 3N1 goes beyond surge protection by helping manage multiple potentially harmful power conditions.
HOW TO SELL IT
Rather than expecting employees to translate technical information into a sales pitch say something like this:
“Instead of simply protecting against surges, Sentry 3N1 helps protect HVAC/R equipment from surges and harmful voltage conditions with the disconnect built right in.”
Customer Says: “I already have a surge protector.”
Then Say: “That’s great for surges. Sentry 3N1 goes further by monitoring voltage conditions that a standard surge protector isn’t designed to address.”
QUICK SPECS
- Application: Single-phase HVAC/R equipment
- Input: 208/240 VAC
- Frequency: 50/60 Hz
- Breaker: 40A @ 240 VAC
- Contactor: 40A FLA, 208/240 VAC
- Maximum Surge Current: 60,000 amps
- Enclosure: NEMA Type 4X
- Voltage Monitor: ICM492DX
- Surge Protection: ICM517A-LITE
- Fault Memory: 50-faults
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