Overview
The Signaline 98A00553-03 undervoltage control relay is a proven industrial control component designed for voltage monitoring and equipment protection. This Model 553 relay monitors supply voltage and disconnects load when voltage falls below safe operating levels, then reconnects when voltage recovers above the pickup threshold. Ideal for machinery protection, critical process equipment, and standby power systems where voltage stability is essential.
Key Features
- Adjustable on-delay from 1 to 120 seconds for controlled restart cycles
- Adjustable off-delay from 1 to 10 seconds for dropout response tuning
- Fast 100 millisecond response time to voltage transitions
- ±0.5% repeat accuracy for consistent trip-point performance
- Compact design with low 5-watt typical power consumption
- 2500 VRMS transient protection for surge suppression
- 10 amp contact rating at 120VAC/DC for general-purpose control loads
Technical Specifications
- Model: 553
- Nominal Voltage: 120VAC, 60 Hz
- Trip Point Dropout: 90VAC
- Trip Point Pickup: 102VAC
- On-Delay: 1–120 seconds (adjustable)
- Off-Delay: 1–10 seconds (adjustable)
- Power Consumption: 5 watts typical
- Transient Protection: 2500 VRMS for 10 milliseconds
- Repeat Accuracy: ±0.5%
- Response Time: 100 milliseconds
- Dead Band: ±2%
- Contact Rating: 10A at 120VAC/DC
Typical Applications
- Three-phase motor soft-starters and variable frequency drives requiring undervoltage lockout
- HVAC equipment protection against low voltage conditions
- Industrial pump and fan control systems
- Critical process equipment requiring unattended operation with voltage supervision
- Standby generator transfer systems with voltage sensing
- General-purpose industrial control panels where voltage monitoring adds protection layers
Compatibility & Replacements
Compatible With
- 120VAC industrial control circuits and PLC input modules
- Standard 8-pin octal relay socket mounts
- DIN-rail mounted panel configurations
- Industrial automation and SCADA systems with 120VAC auxiliary power
- Motor control centers and soft-starter platforms
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering to ensure socket type and control circuit voltage requirements match your application.
Works With
- 120VAC single-phase power supplies
- Industrial motor soft-starters and variable frequency drive (VFD) auxiliary circuits
- Programmable logic controller (PLC) input triggering and feedback circuits
- Standard industrial control relays and contactor interface schemes
- Distributed control systems (DCS) with voltage supervision modules
