Multi-function Digital Protector Relays

Rish Relay UVR

The Rish Relay UVR is an under voltage protection relay designed to safeguard your valuable electrical equipment from under voltage fault conditions. With its settable time delay settings and reliable protection mechanisms, this relay efficiently monitors voltage levels and automatically disconnects loads such as HVAC systems and control panels when under voltage conditions are detected. It prevents costly equipment damage, minimize downtime, and enhance the longevity of electrical systems.

Product Features

• Fixed Under Voltage – Trips when voltage drops below 75% of the nominal value
• Adjustable Power On and Reset Delay – User-configurable delay from 5 to 15 minutes
• Auto-reset Facility – Eliminates the need for human intervention
• Self-Powered – Operates without any external power supply
• LED indications – Simplifies fault diagnosis at a glance
• Flexible Installation Provision – Suitable for both DIN rail and wall mounting
• Compact Design – Ultra-slim 17.5mm width for space-efficient installation

Rish ELPR – Earth Leakage Protection Relay

The purpose of Earth Leakage protection is to measure the Earth leakage current of an electrical installation, or part of an installation, and interrupt the power supply if the Earth-Leakage current becomes dangerous to property.

RISH ELPR is available in two versions, Smart and Smart+

Features

• On-site programmable through potentiometer: Leakage current: 30mA to 30A. Trip Time: 0 to 10sec
• Bar graph LED Display – To indicate measured leakage current in terms of percentage (30% ,45% , 60%, 75% ) of set value of leakage current( In)
• DIP Switch for setting (Available in Smart+ version only): Main relay configuration – Energize / De-energize. Reset configuration – Auto / Manual. Additional relay configuration – Alarm / Fail safe

• Wide Auxiliary Supply : Higher –   60V – 300V AC/DC. Lower  –   20 – 60V DC / 20-40 VAC

• Separate Remote Reset Relay Contact. CBCT Open status Detection
• True RMS Measurement : up to 15th harmonic and categorized under Type A ELR
• Din Rail Mount. Compact Size. Test and Reset Key. LED indications:  for Power On & Relay Trip

Rish Relay – PHR

Rish Relay -PHR monitors AC voltage of a system/equipment and protects it from phase failure issues. Suits applications such as  Control close loop operations, Conveyor system, motor protection from faults like incorrect phase sequence, unbalance in phase or loss of phase

Features

• True RMS measurement
• Self Powered
• Instrument automatically clears (resets) itself as soon as fault condition is recovered
• Compliance to International Safety standard IEC 61010-1-2010
• LED indication for Unbalance, Phase Fail condition and incorrect Phase Sequence condition
• Well suited for 3PH 3W and 3PH 4W applications

Rish Relay – VR

Rish Relay – VR monitors AC voltage of a system/equipment and protects it from overvoltage, undervoltage and phase failure issues. As well as it indicates the occurrence of faults with help of LED indications

Features

• Compact size : Width of 17.5 mm
• True RMS measurement. Self powered
• Under voltage, Over voltage protection as well as protection against Phase unbalance, Phase failure, Incorrect phase sequence & Neutral failure
• LED indication for faults. Disabling of Over & Under Voltage fault on site is possible
• Onsite selection of VLL / VLN value based tripping
• Adjustable Nominal voltage, Trip point, Trip time delay
• Compliance to International Safety standard IEC 61010-1-2010

Rish Relay – AR

Rish Relay – AR monitors AC current of a system/equipment and protects it from overcurrent, undercurrent and current unbalance. As well as it indicates the occurrence of faults with help of LED indications. It is a potentiometer based relay thus it is easy to programme trip points and time delays

Features

• Over Current, Under Current & Current Unbalance Protection
• Nominal current can be set from 1A – 5A on-site
• Adjustable trip point and time delay for Under current and Over current
• Compliance to International Safety standard IEC 61010-1- 2010
• TRMS measurement
• LED indication for Power on, & faults like Under current, Over current, Current unbalance

Rish ELR – Digital Earth Leakage Relay (96 x 96 mm & DIN Rail)

The purpose of Earth Leakage protection is to measure the Earth leakage current of an electrical installation, or part of an installation, and interrupt the power supply if the Earth-Leakage current becomes dangerous to property.

Features

• Leakage current monitoring in 1 & 3 phase system. User selectable trip setting
• Adjustable set point for Pre alarm. Adjustable time delay for Leakage current, Alarm, Power ON
• CBCT Open Detection. Trip relay cum DPM. Auto re-closure / Manual reset
• True RMS measurement . 4 digits ultra bright LED display
• User selectable password protection. Previous fault storage

Applications

• Control panels and switch boards. Sensitive environment like chemical plants, Oil refiners
• Generators, utility power monitoring, Transformers, Motor. Mining and control Engineering

Rish Relay – V/Hz (Digital Line Monitoring Relay)

Rish Relay V/Hz is used to protect against Over Voltage, Under Voltage, Phase Unbalance, Phase Sequence detection, Phase Failure detection, Under and Over Frequency conditions.

Features

• Over & Under voltage protection. Over & Under frequency protection
• Single phasing protection. Phase unbalance protection. Phase incorrect sequence protection
• 4 Digits ultra bright 7 Segment LED Display. Trip Relay cum DPM with Class 0.5
• True RMS measurement. Previous fault Storage. LED Indication

Applications: Used for protecting against over/under voltage, ensuring safe motor and generator operation, switching between main and backup power sources, monitoring UPS and AVR systems, and preventing faults like single phasing or incorrect phase sequence in sensitive electrical equipment.

Rish Relay – V (Digital Voltage Protection Relay)

RISH Relay V is used to protect against Over Voltage, Under Voltage, Phase Sequence detection, Phase Failure detection conditions.

Features

• Over & Under voltage protection
• Single phasing protection. Phase incorrect sequence protection
• 4 Digits ultra bright 7 Segment LED Display. Trip relay cum DPM with Class 0.5
• True RMS measurement. Previous fault Storage. LED Indication

Applications:
Protection against over/under voltage, phase faults, and incorrect sequence; used in motors, gensets, UPS, standby generators, and critical equipment to ensure stable operation and prevent damage from voltage instability or supply failure.

Rish Relay – I (Digital Current Monitoring Relay)

Rish Relay I is used to protect against Over Current, Under Current, Current Loss, Current Un balance.

Features

• Over current protection with IDMT curve. Under current protection
• Current loss protection. Current unbalance protection
• 4 Digits ultra bright Seven segment LED Display. Trip relay cum DPM with Class 0.5

Applications:
Used for monitoring overcurrent, undercurrent, and load conditions in motors, generators, heating systems, and machinery. Ideal for detecting overloads, locked rotors, short circuits, broken drive belts, and ensuring load levels remain within safe operating limits.