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2CDE165010R2001 ABB E236-US2 Undervoltage Monitoring Relay 2CO
ABB E236-US2 is a DIN rail mounted three-phase undervoltage monitoring relay with two changeover contacts, an adjustable 160–240 V AC phase-to-neutral threshold and fixed 5% hysteresis.
£141.33
Why Choose the ABB E236-US2 Undervoltage Monitoring Relay?
The ABB E236-US2 is a modular three-phase undervoltage monitoring relay designed to supervise phase-to-neutral voltages in switchgear and electrical distribution systems. Equipped with two changeover (2CO) output contacts, it provides dependable signalling or control when the monitored voltage falls below the selected threshold.
The E236-US2 monitors a 3N 400/230 V AC system and features an adjustable phase-to-neutral undervoltage threshold from 160 to 240 V AC. A fixed 5% hysteresis helps prevent unstable switching around the selected threshold, while an approximately 100 ms trip delay provides rapid response to undervoltage conditions.
Part of ABB's System pro M compact monitoring range, the E236-US2 occupies two modular spaces and incorporates separate LED indication for supply and relay status. Its compact DIN rail construction makes it suitable for distribution boards, switchgear and safety-related electrical installations requiring continuous three-phase undervoltage supervision.
Key Advantages
- Continuous three-phase undervoltage monitoring from each phase to neutral.
- Adjustable undervoltage threshold from 160 to 240 V AC.
- 2CO output contacts provide flexible signalling and control options.
- Fixed 5% hysteresis supports stable switching around the selected threshold.
- Fast response with an approximately 100 ms tripping delay.
- Green and yellow LEDs provide clear supply and relay-status indication.
- Compact 35 mm two-module width saves distribution-board space.
- DIN rail mounting integrates easily into ABB System pro M compact assemblies.
Key Features
- ABB E236 undervoltage monitoring relay series.
- 3N 400/230 V AC measuring supply.
- 160–240 V AC adjustable threshold phase-to-neutral.
- 2 changeover contacts (2CO).
- 48–63 Hz frequency range.
- 5% fixed hysteresis.
- Approximately 100 ms tripping delay.
- 4 kV rated surge voltage.
- Green LED indicates applied supply voltage.
- Yellow LED indicates relay status.
- Neutral conductor connection is required for correct monitoring operation.
- Compact DIN rail format for modular switchgear installations.
Reliable Three-Phase Undervoltage Monitoring and Protection
The ABB E236-US2 continuously compares each monitored phase voltage against the selected phase-to-neutral threshold. When all phase voltages exceed the threshold plus the switching hysteresis, the relay transfers to its working position and the yellow status LED illuminates. If at least one phase falls below the selected threshold, the relay returns to its normal position and the yellow LED switches off.
This operating principle allows the E236-US2 to provide an electrical response to abnormal undervoltage conditions before downstream equipment is allowed to continue operating without appropriate supervision. A neutral conductor must be connected for correct operation, making the device particularly suited to three-phase plus neutral distribution and switchgear applications.
Typical Applications
- Three-phase switchgear undervoltage monitoring.
- Electrical distribution boards and control panels.
- Industrial power distribution systems.
- Building electrical installations.
- Safety-supply monitoring systems.
- Medical and healthcare electrical installations where applicable design requirements are observed.
- Public and commercial facilities requiring supervised electrical supplies.
Technical Specifications
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| Mounting Type | DIN rail | |
|---|---|---|
| Series | E236 / System pro M compact | |
| SKU | E236US2 | |
| ABB order code | 2CDE165010R2001 | |
| Product type | Undervoltage monitoring relay | |
| Monitoring function | Three-phase undervoltage, phase-to-neutral | |
| Output contacts | 2CO | |
| Measuring supply | 3N 400/230 V AC | |
| Adjustable threshold | 160–240 V AC | |
| Hysteresis | 5% fixed | |
| Frequency | 48–63 Hz | |
| Rated contact voltage | 250 V AC | |
| Switching capacity with devices spaced less than 5 mm | 750 VA, 3 A at 250 V AC | |
| Switching capacity with devices spaced more than 5 mm | 1250 VA, 5 A at 250 V AC | |
| Rated insulation voltage | 250 V AC | |
| Rated surge voltage | 4 kV | |
| Tripping delay | Approximately 100 ms | |
| Mechanical service life | 20 × 106 operations | |
| Setting tolerance | ≤5% | |
| Repeat accuracy | ±1% | |
| Temperature effect | ≤0.1%/°C | |
| Terminal capacity | Up to 4 mm² | |
| Power loss | 1.7 W | |
| Operating temperature | -25 to +55 °C | |
| Overvoltage category | III | |
| Status indication | Green supply LED / yellow relay-status LED | |
| Mounting type | DIN rail | |
| Modular width | 2 modules | |
| Dimensions (H × W × D) | 87 × 35 × 60 mm | |
| Product weight | Approximately 0.1 kg | |
| EAN | 4016779511094 |
Frequently Asked Questions
What is the ABB E236-US2 used for?
The ABB E236-US2 is an undervoltage monitoring relay used to supervise three phase-to-neutral voltages and operate its output contacts when an undervoltage condition occurs.
What is the adjustable threshold range of the ABB E236-US2?
The E236-US2 provides an adjustable phase-to-neutral undervoltage threshold from 160 to 240 V AC, with a fixed 5% hysteresis.
How many output contacts does the E236-US2 provide?
The E236-US2 provides two changeover contacts (2CO) for connection to signalling, control or protective circuits.
How quickly does the ABB E236-US2 respond to undervoltage?
The E236-US2 has an approximate 100 ms tripping delay, enabling rapid response when a monitored phase falls below the selected threshold.
Does the ABB E236-US2 require a neutral connection?
Yes. A neutral conductor must be connected because the E236-US2 monitors the individual phase voltages with respect to neutral.
Trusted ABB Voltage Monitoring
ABB E236 monitoring relays provide compact and dependable three-phase undervoltage supervision, combining adjustable voltage monitoring, changeover outputs and clear status indication for professional electrical distribution and switchgear applications.
