Three-phase Q relay Enphase Q-RELAY-3P-INT - IQ7/IQ8 Microinverter Decoupling Protection

Enphase three-phase Q relay - Intelligent decoupling protection

The Enphase 3-Phase Q-Relay (Q-RELAY-3P-INT ) is an intelligent 4-pole decoupling protection device designed for photovoltaic installations with Enphase IQ7 and IQ8 series microinverters. It continuously monitors the grid and automatically disconnects the microinverters in the event of a grid fault, in accordance with strict European regulations.

This relay is essential for Enphase three-phase installations to ensure compliance with grid safety standards and to enable automatic reconnection when normal conditions are restored.

Grid safety and compliance

The four-pole Q Relay monitors power system parameters in real time and reacts instantly to faults:

• Voltage monitoring: Automatic detection of overvoltage and undervoltage on each phase (L1, L2, L3)
• Frequency monitoring: Protection against frequency variations (min f / max f)
• DC injection detection: Continuous measurement of DC injection to protect the network
• Four-pole isolation: Physical disconnection of all phases (L1, L2, L3) and neutral (N)
• Automatic reconnection: Automatic re-establishment of connection when normal network conditions return

Regulatory compliance: The Q Relay meets the strict requirements of the European decoupling protection standards for grid-connected photovoltaic installations (IEC 61010, EN 61010-1).

Intelligent operation with Envoy-S

The Q Relay works in perfect synergy with the Enphase Envoy-S gateway for centralised, intelligent management:

• Communication via Envoy-S: The relay receives its commands and transmits its status via the Envoy-S gateway.
• Remote software updates: Relay firmware can be updated via the Enphase cloud
• Flexible configuration: The relay can be configured to monitor 1, 2 or 3 phases depending on your installation
• Real-time monitoring: View relay status via the Enphase Enlighten application

Quick and easy installation

Designed to facilitate the work of installers, the three-phase Q Relay stands out for its ease of installation:

• Standard 35mm DIN rail mounting: Quick installation in any electrical panel
• Compact and lightweight: Only 107mm wide (approx. 6 DIN modules)
• Clear terminal blocks: Easy identification of inputs (L1, L2, L3, N) and outputs
• Integrated diagnostic LEDs: 4 red/green LEDs for instantaneous display of the status of each phase and tripping conditions

Detailed technical specifications

Installation capacity per phase

Important note: For three-phase installations, the total system power can be up to 18 kW (6 kW x 3 phases) with a single three-phase Q Relay.

Visual diagnostics with LEDs

The Q Relay incorporates a system of 4 red/green LEDs for easy diagnosis:

• 🔴 LED L1 (red): Overvoltage or undervoltage detected on phase L1.
• 🔴 LED L2 (red): Overvoltage or undervoltage detected on phase L2.
• 🔴 LED L3 (red): Overvoltage or undervoltage detected on phase L3.
• 🔴 LED F/DC (red): Frequency trip (min f / max f) or DC injection detected.
• 🟢 strong>All LEDs green: Normal operation, all phases OK

Applications and compatibility

The three-phase Q Relay is designed for Enphase three-phase photovoltaic installations:

• Three-phase residential installations up to 18 kW
• Commercial and SME installations with Enphase microinverters
• IQ7, IQ7+, IQ7X, IQ7A microinverter compatible
• IQ8M, IQ8+, IQ8P, IQ8MC microinverter compatible
• Requires Enphase Envoy-S gateway (Standard or Metered)
• Limited to a maximum of 20 active Q Relays per Enphase system

Compatible Enphase ecosystem

For a complete and optimal Enphase installation, the three-phase Q Relay works with :

• IQ7 series microinverters: IQ7, IQ7+, IQ7X, IQ7A - discover our IQ7 microinverter range

• IQ8 series microinverters: IQ8M, IQ8+, IQ8P, IQ8MC - discover our IQ8 microinverter range

• Envoy-S Standard Gateway: Basic PV production monitoring - see Envoy-S Standard

• Envoy-S Metered Gateway: Monitoring production + consumption - see Envoy-S Metered

• Enphase Enlighten application: Real-time monitoring on smartphone/tablet/computer

Installation and commissioning

The three-phase Q Relay must be installed by a certified Enphase installer:

1. DIN rail mounting: Install the relay in the AC electrical panel on a 35mm DIN rail.
2. Input connection: Connect the 3 phases + neutral from the main switchboard to the relay input terminals.
3. Output connection: Connect the relay outputs to the Enphase microinverters (via AC connection box)
4. Envoy-S connection: Connect the relay to the Envoy-S gateway (PLC connection via mains)
5. Software configuration: Set up the relay via the Enphase Installer App (number of phases monitored, thresholds, etc.)
6. Function test: Check diagnostic LEDs and display in Enlighten

⚠️ Important: Installation of an Enphase system with Q Relay requires Enphase certification. Only certified installers can activate the system via the Enphase Installer App.

Benefits of the Enphase 3-phase Q Relay

• Maximum safety: Four-pole isolation (L1, L2, L3, N) in the event of a mains fault.
• Guaranteed compliance: Meets strict European mains protection standards
• Automatic reconnection: No manual intervention required
• Flexible configuration: 1, 2 or 3 phases depending on installation
• Visual diagnostics: 4 LEDs for rapid fault identification
• OTA updates: Firmware updated remotely via Enphase cloud
• 5-year warranty: Enphase manufacturer coverage
• Enphase ecosystem: seamless integration with IQ7, IQ8, Envoy-S, Enlighten

Order your three-phase Q Relay for intelligent network protection now!