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The GIC Digital Voltage Monitoring Relay Series SM 800 (Model DMS120) is a high-precision, versatile voltage monitoring and protection device designed for industrial and commercial three-phase electrical systems. Operating with a multi-voltage range of 145-500 VAC, it supports both three-phase 3-wire and 4-wire configurations. This relay safeguards electrical installations against critical anomalies such as phase loss, phase sequence errors, phase asymmetry, under voltage, over voltage, neutral loss (applicable for 3P4W), and frequency deviations including over-frequency and under-frequency conditions. Featuring a user-friendly LCD display with a green backlight, it provides real-time voltage monitoring and programmable settings. The SM 800 includes adjustable ON/OFF time delays (Power ON Delay from 0 to 999 seconds and OFF Delay from 0.1 to 999 seconds), two independent relay outputs with 5A rating for control applications, password protection for settings, and fault logging of the last five events to enhance maintenance and troubleshooting. Additional operational modes include fail-safe/non-fail-safe relay outputs and manual latch/auto non-latch functions, making it highly adaptable for various industrial power protection needs.
Key Features
| Features | Description |
|---|---|
| Voltage Range | 145-500 VAC |
| Phases Supported | Three Phase 3 Wire & Three Phase 4 Wire |
| Relay Outputs | Two Relay Outputs (1C/O + 1C/OS), 5A Single and Dual Relay Outputs |
| Protection Functions | Phase Loss, Phase Sequence, Phase Asymmetry, Under Voltage, Over Voltage, Neutral Open (for 3P4W), Over Frequency, Under Frequency |
| Display | LCD Display with Green Backlight |
| Time Delay Settings | Power ON Delay 0-999 seconds, OFF Delay 0.1-999 seconds, Adjustable in seconds/minutes |
| System Configurability | Configurable for 3 Phase 3 Wire or 3 Phase 4 Wire System |
| Safety Features | Password Protection, Fail-Safe/Non-Fail-Safe Relay Output |
| Fault Logging | Log of 5 Previous Faults |
| Operational Modes | Latch (Manual) and Non-Latch (Auto) Modes |
| Attributes | Description |
|---|---|
| Model Number | DMS120 |
| Input Voltage | 145-500 VAC |
| Phase Type | 3 Phase 3 Wire and 3 Phase 4 Wire |
| Relay Contact Configuration | 1C/O + 1C/OS (SPDT relays) |
| Relay Contact Rating | 5 Amperes |
| Display Type | LCD with Green Backlight |
| Power ON Delay Range | 0 to 999 seconds |
| Power OFF Delay Range | 0.1 to 999 seconds |
| Protection Mechanisms | Phase loss, phase sequence, asymmetry, under/over voltage, neutral loss, over/under frequency |
| Fault Memory | Stores last 5 fault events |
| Password Protection | Enabled |
| Operating Modes | Fail-Safe / Non-Fail-Safe, Manual Latch / Auto Non-Latch |
| Applicable Wiring System | Suitable for industrial three-phase electrical systems |
| Dimensions | Standard DIN rail mount (exact size to be confirmed from datasheet) |
*Disclaimer: The above description has been AI-generated and has not been audited or verified for accuracy. It is recommended to verify product details independently before making any purchasing decisions.
Yes, the SM 800 supports configuration for both three-phase 3-wire and 4-wire electrical systems, making it versatile for various industrial applications.
The relay protects against phase loss, phase sequence errors, phase asymmetry, under voltage, over voltage, neutral loss (specifically for 3P4W systems), and frequency deviations including over-frequency and under-frequency.
It maintains a log of the five most recent fault incidents, allowing operators to review last events for maintenance and troubleshooting.
Yes, the relay allows adjustable power ON delay from 0 to 999 seconds and OFF delay from 0.1 to 999 seconds to prevent nuisance tripping.
Yes, the SM 800 has password protection to secure settings and configurations from unauthorized changes.
GIC DMS120 Digital Voltage Monitoring Relay SM 800,Voltage 145-500 VAC, 1C/O + 1C/OSingle Phasing Preventor+ Selectable Under Voltage + Selectable Over Voltage + Neutral Loss ( Applicable for 3P4W).Power ON Delay 0 to 999 sec , OFF Delay 0.1 to 999 sec .
Feature -
LCD Display with Green backlight
Multi-Voltage: Three Phase 4 Wire & Three Phase 3 Wire @ 145-500 VAC
Protection against Phase loss, Phase Sequence, Phase Asymmetry, Under Voltage, Over Voltage, Neutral Open, Over Frequency and Under Frequency
Can be configured for 3 Phase 3 Wire or 3 Phase 4 Wire system
Selectable Over Voltage/ Under Voltage, Asymmetry, Phase Loss, Phase Sequence, Over Frequency/ Under Frequency
Adjustable ON/OFF Time Delay in seconds/ minutes
5A Single and Dual relay outputs
Two Separate Relay outputs with independent Programming
Password protection
Log of 5 previous faults for better monitoring
Fail safe/ Non-Fail safe relay output
Latch (Manual) and Non-Latch (Auto) Modes
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