GIC MG21DF Voltage Monitoring
The GIC MG21DF Voltage Monitoring offers 208 - 480 VAC, (3 Phase 3 Wire) supply voltage, 1 C/O relay output, Base / DIN rail mounting, IP 20 for Terminal, IP 30 for Enclosure degree of protection. Manufactured by GIC under the GIC Voltage Monitoring category, this model belongs to the GIC DM Series.
| Brand | GIC |
| Product Type | Voltage Monitoring |
| Model Number | MG21DF |
GIC MG21DF Voltage Monitoring – Technical Specifications
| Specification | Value |
|---|---|
| Supply Voltage | 208 - 480 VAC, (3 Phase 3 Wire) |
| Supply Variation | -12% to + 10% |
| Frequency | 50/60 Hz |
| Power Consumption (Max.) | 3 VA |
| Phase Loss | Yes |
| Phase Asymmetry | 10% Fixed |
| Under Voltage | -5% to -25% |
| Over Voltage | 5% to +25% |
| ON Delay | 5s |
| Trip Time (OFF Delay) | 0.5 to 15 s (Selectable) |
| Relay Output | 1 C/O |
| Contact Rating | 5A @ 250 VAC / 30 VDC (Resistive) |
| Electrical Life | 1X10^ 5 |
| Mechanical Life | 3X10^ 6 |
| Utilization Category AC-15 | Rated Voltage (Ue): 120/240 V, Rated Current (Ie): 3.0/1.5 A |
| Utilization Category DC-13 | Rated Voltage (Ue): 24/125/250 V, Rated Current (Ie): 2.0/0.22/0.1 A |
| Operating Temperature | - 15 C to +60 C |
| Storage Temperature | - 20 C to +80 C |
| Humidity (Non Condensing) | 95% (Rh) |
| Enclosure | Flame Retardant UL 94-V0 |
| Dimension (W x H x D) (in mm) | 18 X 90 X 58.5 |
| Weight | 70 g |
| Mounting | Base / DIN rail |
| Degree of Protection | IP 20 for Terminal, IP 30 for Enclosure |
The GIC MG21DF Voltage Monitoring device provides dependable protection for three-phase systems operating on 208–480 VAC supply with a variation tolerance of -12% to +10%. With a low power consumption of 3 VA, it is efficient and reliable. It offers robust protection against phase loss, fixed 10% phase asymmetry, as well as under-voltage (-5% to -25%) and over-voltage (+5% to +25%). Designed for safety, it includes a 5-second ON delay and a selectable OFF delay from 0.5 to 15 seconds, allowing flexible response to system conditions. Equipped with a 1 C/O relay output rated at 5A @ 250 VAC/30 VDC, it ensures safe switching for alarms or auxiliary circuits. With an electrical life of 100,000 operations and a mechanical life of 3 million, the MG21DF is built for long service in demanding environments. Its compact design (18 × 90 × 58.5 mm, 70 g) with UL 94-V0 flame-retardant housing provides durability, while IP20 terminal protection and IP30 enclosure protection enhance operational safety.
Applications of the MG21DF Voltage Monitoring include industrial automation panels, motor protection systems, HVAC units, elevators, and commercial building infrastructure where stable supply is essential. By detecting supply faults early, it prevents costly downtime, enhances equipment life, and ensures smooth operations. In manufacturing environments, it supports continuous production by monitoring voltage conditions, while in building management systems it safeguards critical infrastructure like compressors and lifts. Its wide operating range of -15°C to +60°C with 95% humidity tolerance makes it suitable for diverse conditions. Maintenance teams appreciate its compact DIN rail mounting and fast setup, while training institutes use it to demonstrate practical applications of voltage monitoring in power systems.
Backed by GIC’s expertise in industrial automation, the MG21DF Voltage Monitoring unit combines accuracy, rugged construction, and long-lasting dependability. With its advanced protections, durable build, and versatile applications, it is a trusted solution for engineers, system integrators, and industries requiring reliable voltage supervision.
