In most procurement cycles, MD21DF is considered with GIC Temperature Controller, GIC Mg73Bh and GIC GIC, giving decision-makers confidence that theyโve chosen the most dependable component.
GIC MD21DF Voltage Monitoring
The GIC MD21DF 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 | MD21DF |
GIC MD21DF Voltage Monitoring โ 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 |
| Under Voltage | -2% to -20% |
| Over Voltage | 2% to +20%P31 |
| 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 MD21DF operates on a 208โ480VAC three-phase supply, consuming only 3VA while delivering stable performance across industrial networks. Its monitoring range includes under voltage from -2% to -20% and over voltage from +2% to +20%, with a selectable trip delay of 0.5 to 15 seconds, ensuring flexibility for diverse load conditions. The built-in ON delay of 5 seconds helps avoid nuisance tripping, while the phase loss detection capability ensures uninterrupted protection for motors, control panels, and automation equipment.
Engineers rely on the MD21DF GIC Voltage Monitoring Relay because of its durability and safety. With a relay output of 5A at 250VAC/30VDC, it supports both resistive and inductive loads. Its flame-retardant UL 94-V0 enclosure, IP20/IP30 protection, and wide operating temperature from -15ยฐC to +60ยฐC make it a dependable choice in harsh environments. Mechanical life of 3 million operations and electrical life of 100,000 cycles reflect its robustness, while DIN rail mounting ensures simple installation in compact panels. The MD21DF datasheet confirms compliance with AC-15 and DC-13 utilization categories, reinforcing its industrial reliability.
Applications of the GIC MD21DF Voltage Monitoring relay include HVAC units, pumps, elevators, packaging lines, and power distribution boards where voltage imbalance or loss could damage critical equipment. OEMs integrate this model into automation panels to improve system uptime, while maintenance teams choose it for its precise monitoring and consistent relay response. Available through wholesalers, dealers, and distributors, the GIC MD21DF helps safeguard processes by providing advanced protection with ease of integration.
The GIC MD21DF Voltage Monitoring Relay is trusted for accuracy, long service life, and compliance with industry standards. Supported by the official MD21DF GIC datasheet, it remains a go-to choice for engineers seeking efficiency, safety, and reliability in automation systems. For complete details and technical documentation, visit the official GIC Voltage Monitoring page.
