Voltage Protection Relays

The Radix Voltage Protection Relay range continuously monitors supply voltage and protects electrical equipment against abnormal operating conditions. Designed for industrial, commercial and agricultural applications, these relays automatically disconnect the load whenever unsafe supply conditions are detected, helping improve equipment reliability and reduce unplanned downtime.

The product range includes Single Phase Protection Relays, Three Phase Voltage Protection Relays and Single Phase Protection Relays with Auto/Manual Restart, offering dependable protection for motors, pumps, compressors, generators, HVAC systems, OEM equipment and electrical distribution panels.

Why Choose Radix Voltage Protection Relays?

Key Features

1. Continuous Voltage Monitoring
2. Over Voltage Protection
3. Under Voltage Protection
4. Phase Sequence Protection*
5. Phase Loss / Failure Protection*
6. Phase Asymmetry Protection*
7. Adjustable Trip Delay
8. Adjustable Power-On Delay
9. Voltage Hysteresis
10. Factory Set and User Programmable Models
11. Auto / Manual Restart Models
12. Relay Output (SPDT)
13. Bright LED Status Indication
14. Compact DIN Rail Mounting

*Available on selected models.

Available Product Series

V17F Series

1. Factory-set Three Phase Voltage Protection Relays for quick installation and standard applications.
2. Factory configured settings
3. No programming required
4. Fast commissioning
5. Compact 17.5 mm DIN Rail enclosure
6. Ideal for OEM panels and standard electrical systems

V17S Series

User-programmableThree / Single Phase Voltage Protection Relays for applications requiring adjustable protection settings.

1. Adjustable Over Voltage & Under Voltage
2. Adjustable Trip Delay
3. Adjustable Power-On Delay
4. Voltage Hysteresis
5. Compact 17.5 mm DIN Rail enclosure
6. Suitable for industrial automation and electrical distribution systems

SPP17 Series (Single Phase Preventor)

Compact Three Phase Voltage Protection Relays for monitoring single-phase electrical supplies.

1. Over Voltage Protection
2. Under Voltage Protection
3. Adjustable Trip Delay
4. Compact 17.5 mm DIN Rail enclosure
5. Suitable for pumps, compressors and HVAC equipment

SPP Series with Auto / Manual Restart

Advanced Three Phase Voltage Protection Relays with selectable restart modes.

1. Auto Restart mode
2. Manual Restart mode
3. Adjustable Voltage Limits
4. Adjustable Trip Delay
5. Adjustable Power-On Delay
6. Compact 33.5 mm DIN Rail enclosure
7. Ideal for pumps, water supply systems and unattended installations

Protection Functions

Depending on the selected model, Radix Protection Relays provide:

1. Voltage Protection: Over Voltage, Under Voltage
2. Phase Protection: Phase Sequence, Phase Failure, Phase Loss, Phase Asymmetry
3. Timing Functions: Trip Delay, Reset Delay, Power-On Delay, Voltage Hysteresis

Single Phase or Three Phase – Which Relay Should You Choose?

Choose a Single Phase Protection Relay when your application requires:

1. Pump protection
2. Air conditioners
3. Refrigeration systems
4. Compressors
5. Water treatment equipment
6. Residential and commercial loads

Choose a Three Phase Voltage Protection Relay when your application requires:

1. Motor protection
2. Generator panels
3. MCC Panels
4. PCC Panels
5. Industrial machinery
6. Three Phase distribution systems

Factory Set or Programmable?

Choose V17F Series when:

1. Standard protection settings are acceptable
2. Faster installation is required
3. No field programming is needed

Choose V17S Series when:

1. Protection settings need adjustment
2. Different operating voltages are used
3. Greater application flexibility is required

Why Choose Auto / Manual Restart?

The SPP Auto/Manual Restart Relay allows users to select the most suitable operating mode.

Auto Restart

1. Automatically restores supply after voltage returns to normal.
2. Suitable for unattended equipment and pumping applications.

Manual Restart

1. Requires operator intervention before restarting.
2. Ideal where controlled restart improves operational safety.

Typical Applications

Radix Voltage Protection Relays are suitable for:

1. Motor Control Centres (MCC)
2. PCC Panels
3. Generator Control Panels
4. Pump Control Panels
5. Borewell Pumps
6. Irrigation Systems
7. Compressors
8. HVAC Equipment
9. Refrigeration Systems
10. Water Treatment Plants
11. OEM Equipment
12. Industrial Automation
13. Switchgear
14. Electrical Distribution Panels

Certifications & Compliance

Safety & Construction

1. Compact DIN Rail Mount Design
2. Tool-free Rotary Setting Knobs
3. High Visibility LED Status Indication