Digital guide
You are here:
GE 7556D26G1
Product Name: GE Multilin 7556D Voltage & Reactive Power Control Relay (Base Version)
Product Introduction: The base-configuration variant of the 7556D series, sharing the same hardware platform as the G2 version but with standard communication configuration and firmware differences. Suited for standard voltage/reactive power control needs in medium- and low-voltage distribution networks for capacitor bank switching and transformer tap adjustment.
Detailed content
Technical Specifications:
-
Rated Voltage: 110 V / 220 V DC or AC
-
Control Outputs: 9 standard channels
-
Communication Interface: RS-485 (Modbus RTU)
-
Output Contact Rating: 5 A @ 250 V AC (resistive load)
-
Analog Inputs: 4–20 mA or 0–20 mA (configurable)
-
Digital Inputs: 8 dry-contact inputs
-
PT/CT Support: Up to 4 groups of PT and 4 groups of CT
-
Protection Logic: Over-voltage / under-voltage, over-current
-
Operating Temperature: –25 °C to +70 °C
-
Ingress Protection: IP50 (front panel)
-
Mounting: DIN rail mount (35 mm standard rail)
-
Certifications: UL 61010-1, IEC 61010-1, CE marked
Functional Features: Standard AVR algorithm; capacitor round-robin switching logic with equal-interval and coded switching modes; V/Q curve setting; hardware-compatible with G2 (firmware-upgradeable to G2).
Application Scenarios: Power distribution, factory distribution rooms, commercial building electrical systems.
Installation Requirements: DIN rail mounted in a control panel. CT and PT wiring per terminal diagram. Communication via RS-485 shielded cable.
Usage Notes: CT secondary must never be open-circuited during operation. Periodically verify PT/CT ratio parameters. Do not operate beyond rated temperature range.
