Get A Quote
My Account
To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | TimeMark |
| Manufacturer Product Number | 21-H/SG |
| Description | Phase Monitor Relay; 3-Phase; 475-600V AC; 10 A at 240 V AC resistive |
| Datasheet | Download Datasheet |
The TimeMark 21-H/SG is a 3-phase monitor for 475-600 V AC, 50/60 Hz systems. It drops its output relay out on phase loss, phase reversal, over/under voltage and voltage unbalance and resets once the fault clears.
Trip points: undervoltage 90% of the setting ±1% (resets at 93%); overvoltage 110% of the setting ±1% (resets at 107%); unbalance 2-8% adjustable (resets 0.7% below the setting). Trip delay: undervoltage 1-30 s adjustable (over, under and unbalance); 1 s fixed on single phasing or unbalance over 15%. Restart: 1-500 s (adjustable). Reset: automatic.
Output: 1C SPDT (silver with gold flash), 10 A at 240 V AC resistive. Mounting: plug-in, on an 8-pin octal (TimeMark 51X120 socket) base. Indicator: Red and green status LEDs (UNDER, OVER, UNBAL/SINGLE PH, REVERSE PHASE on red; RUN, RESTART DELAY on green). Approvals: UL Recognized (U.S. and Canada).
| Category | |
| Manufacturer | TimeMark |
| Model | 21 |
| Monitoring Function | Phase Loss, Phase Reversal, Over/Under Voltage and Voltage Unbalance |
| Number of Phases | 3-Phase |
| Input Voltage | 475-600V AC |
| Undervoltage Trip Range | 90% of the setting ±1% (resets at 93%) |
| Overvoltage Trip | 110% of the setting ±1% (resets at 107%) |
| Phase Unbalance Trip | 2-8% adjustable (resets 0.7% below the setting) |
| Restart Delay (s) | 1...500 s (adjustable) |
| Trip Delay - Undervoltage (s) | 1...30 s adjustable (over, under and unbalance); 1 s fixed on single phasing or unbalance over 15% |
| Reset Method | Automatic |
| Status Indicator | Red and green status LEDs (UNDER, OVER, UNBAL/SINGLE PH, REVERSE PHASE on red; RUN, RESTART DELAY on green) |
| Contact Configuration | 1C SPDT (silver with gold flash) |
| Output Rating | 10 A at 240 V AC resistive |
| Number of Poles | 1 |
| Mounting Type | Socketable |
| Termination Style | Plug In, 8 Pin (Octal) |
| Dimensions | 3.53 x 1.77 x 2.45 (2.98 body) (dimensions have a tolerance of ± 0.06) |
| Socket Family | 8 Pin Octal (TimeMark 51X120 socket) |
| Approvals | UL Recognized (U.S. and Canada) |