ABB EMEV-S51-1 Single-Load EV Energy Management System (EVEMS)
MFR Part #:EMEV-S51-1
- Amperage Rating :16 to 50 A
- Enclosure Type :Type 1
- Manufacturer Name :ABB
- This Product Replaces :EVEMS240-100
- Voltage Rating :208/240 V A
The ABB EMEV-S51-1 is a single-load Energy Management System (EVEMS/EMS) designed to monitor electrical service load and automatically control connected equipment such as EV chargers. It helps prevent circuit overload by switching the controlled device on or off based on real-time load conditions.
Built for single-phase systems, this unit is ideal for installations where electrical capacity must be managed safely and efficiently.
- EVEMS SINGLE 50A/100A NEMA 1
Active load monitoring system → Continuously measures electrical usage to prevent circuit overloads
Automatic load control (ON/OFF switching) → Protects electrical infrastructure by disconnecting the controlled device when load thresholds are exceeded
Supports EV charger integration → Designed to control electric vehicle charging loads or similar controlled devices
Single-load energy management → Focused control for one connected device, simplifying installation and configuration
Configurable control settings (DIP switches + time dial) → Allows customization based on breaker size and load requirements
Adjustable restart delay (0–15 minutes) → Controls when power is restored after load conditions stabilize for improved system stability
Automatic recovery after power outage → Resumes operation only after confirming safe load conditions
Integrated current monitoring devices (CTs) → Enables accurate measurement of service load for reliable control decisions
Single circuit load sharing capability → Allows prioritization between loads in supported configurations (specific models only)
Compact enclosure design → Easy integration into electrical setups with manageable footprint
Specification
Details
Product Type
Single-load EV Energy Management System (EVEMS/EMS)
Model
EMEV-S51-1
Electrical System
Single phase
Voltage
208/240 V or 120/240 V AC
Frequency
50/60 Hz
Service Monitored
60 A to 100 A main breaker range
Controlled Device Current
Up to 50 A
Wire Size (Main Lugs)
14 AWG to 4 AWG (copper only)
Torque (Main Lugs)
40 in-lb (4.5 Nm)
Operating Temperature
-20°C to 40°C (-4°F to 104°F)
Dimensions (H × W × D)
9 × 7 × 4 in (229 × 178 × 102 mm)
Weight
7 lb (3.2 kg)
Time Delay Range
0 to 15 minutes (adjustable; factory set ~7 min)
Enclosure Type
Type 1
Included Components
EVEMS/EMS unit, current monitoring devices (2), wiring accessories, labels
Residential EV charger load management where panel capacity is limited
Electrical service upgrade avoidance by managing existing load instead of expanding infrastructure
Single-device load control in systems requiring prioritized energy use
Installations with variable electrical demand where automated load shedding is required
Compatible with:
- Electric vehicle chargers or receptacles used for EV charging
- Electrical systems within:
- 60 A to 100 A main breaker configurations
- 120/240 V or 208/240 V single-phase supply
Requirements / Limitations:
- Designed for loads that can tolerate power cycling (ON/OFF switching)
- Not recommended for devices requiring continuous, uninterrupted power
- Requires professional installation in accordance with electrical codes
What does the ABB EMEV-S51-1 do?
The ABB EMEV-S51-1 monitors electrical load and automatically turns a connected device (such as an EV charger) ON or OFF to prevent overloading the circuit.
Can the ABB EMEV-S51-1 be used with any electrical device?
No. It is intended for devices that can tolerate being switched ON and OFF. It is not suitable for equipment requiring continuous power.
How does the system restore power after shutting off a device?
After load conditions fall below the configured threshold, the system waits for a set time delay (0–15 minutes) and then automatically restores power.
Does the unit work after a power outage?
Yes. After power is restored, the system verifies that load conditions are safe before re-energizing the controlled device.
What electrical systems is the ABB EMEV-S51-1 compatible with?
It is designed for single-phase systems operating at 120/240 V or 208/240 V, with main breakers ranging from 60 A to 100 A.