Line Voltage and Current Monitor Relays
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Bulletin 813S Phase Monitor
Line Voltage Monitor
- Detects Phase Failure, Voltage Unbalance, Phase Reversal, and Undervoltage
- Provides Pre-Start and Running Protection on the Line Side of the Point of Connection
Line Current Monitor
- Detects Phase Failure, Current Unbalance and Phase Reversal
- Provides Running Protection on the Line and Load Side of Point of Connection when Used in a Single Motor Branch Circuit
Line Voltage Monitor and Line Current Monitor are solid-state devices designed for use in 3-phase systems to protect motors and other loads against abnormal voltage/current conditions. In general, the Line Voltage Monitor is applied where pre-start and line-side protection are important, whereas the Line Current Monitor is applied where line- and loadside protection are important.
Standards Compliance and Certifications
- CSA Certified
- UL Listed
Product Selection
Product Selection — Line Monitor Relays
| Line Voltage Monitor Relays — Automatic Reset | Line Current Monitor Relays ⋆ Prices Do Not Include Current Transformers | ||||
| Line Voltage, 3-Phase | Hz | Open Type | Supply Voltage, Single-Phase, 60 Hz‡ | Reset | Open Type |
| Cat. No. | Cat. No. | ||||
| 380 | 50 | 813S-VON | 120 | Automatic | 813S-COWEA |
| 415 | 50 | 813S-VOI | 208 | 813S-COHA | |
| 440 | 50 | 813S-VOQ | 240 | 813S-COAA | |
| 480 | 813S-COBA | ||||
| 600 | 813S-COCA | ||||
| 120§ | 60 | 813S-VOWE | 120 | Manual | 813S-COWEM |
| 208 | 60 | 813S-VOH | 208 | 813S-COHM | |
| 240 | 60 | 813S-VOA | 240 | 813S-COAM | |
| 480 | 60 | 813S-VOB | 480 | 813S-COBM | |
| 600 | 60 | 813S-VOC | 600 | 813S-COCM | |
| ⋆ For applications using Size 5 and larger starters, the current transformers supplied with the starter for the heater element circuits can also be used for the Line Current Monitor input circuits. ‡ Output contact is rated 250V AC maximum for all devices, regardless of supply voltage. § The 120V device is typically connected to the secondary of potential transformers to monitor line voltages above 600V. |
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Specifications
Line Voltage Monitor
| Line Voltage | 380V, 415V, 440V, +10%, –20%, 3-phase, 50 Hz, ± 1%; 120V, 208V, 240V, 480V, 600V, +10%, –20%, 3-phase, 60 Hz, ±1% Use device only at nameplate rating. |
| Temperature Range | –20…+60 °C (–4…+140 °F) |
Output Contact Range
| Volts AC | Make | Break | Volts DC | Make/Break |
| 170…600 48…170 1…48 |
4800 VA 28.2 A 28.2 A |
480 VA 480 VA 10 A |
1…28 |
10 A |
| Continuous Carrying Current: 10 A | ||||
Line Current Monitor
| Supply Voltage | 120V, 208V, 240V, 480V, 600V, +10%, –20%, single-phase, 60 Hz Use only at voltages listed on relay nameplate. Power requirement is 4.4 VA. |
| Input Current Normal operating range Maximum continuous current Maximum inrush current Input impedance |
3-phase, 60 Hz, ±1% 0…5 A 10 A 35 A for 5 s 0.005 W for each phase |
| Temperature Range | –20…+60 °C (–4…+140 °F) |
Output Contact Ratings
| Volts AC | Make | Break | Volts DC | Make/Break |
| 125…250, 1…125 | 2200 VA, 17.6 A | 220 VA, 1.76 A | 1…30 | 3 A |
| Continuous Carrying Current: 5 A AC or DC | ||||
Typical Wiring Diagrams
See Applicable Codes and Laws
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Line Voltage Monitor — Provides pre-start and running protection against abnormal voltage conditions on line side of voltage monitor only.
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Line Current Monitor — Protects on line and load side of current transformers (CT) when used in single motor branch circuit. Current unbalance protection is effective during motor running period only. Phase failure and reversal protection is provided during both starting and running periods.
Approximate Dimensions
Dimensions are shown in millimeters (inches). Dimensions are not intended to be used for manufacturing purposes.
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Open Type — Dimensions above apply to both the voltage and current monitor versions. The devices can be installed in any position. They can be installed directly on a panel, or installed on Bulletin 700 Type MP mounting strip. The relay will occupy three mounting strip spaces.