The Sync Energy EVAB1ETP400 is a three-phase EV load balancer kit supplied with three 400A split core CT clamps. It is the high-capacity kit in the EVAB1 range for compatible Sync Energy charger installations where demand needs to be monitored across a three-phase supply. The package includes the balancer hub in an IP20 enclosure, three 400A CTs, MCB and wiring terminals. The hub is supplied from a 220-240V, 50-60Hz single-phase feed and communicates with connected chargers using RS485. It supports up to 16 compatible chargers per hub when the charger circuits and site supply have been designed for the minimum current requirement. For installers, the product is primarily a site load management component: it allows EV charging capacity to expand while keeping charger output controlled against the configured supply limit.

• Three-phase dynamic EV load balancer kit
• Supplied with 3 x 400A split core CT clamps
• Balancer hub supplied in an IP20 enclosure
• Includes MCB and wiring terminals
• 220-240V, 50-60Hz supply to the balancer
• RS485 communication to compatible chargers
• Supports up to 16 compatible chargers per hub

Three-phase charger load control

EVAB1ETP400 is selected where the monitored supply is three phase and each phase requires a high-capacity CT clamp. The three supplied 400A split core CTs distinguish it from the single-phase EVAB1ESP120 kit, which includes one 120A CT. That difference is the main buying decision, because both kits use the same balancer role but are packaged for different supply monitoring requirements.

The balancer helps prevent connected chargers from exceeding the configured building or EV circuit limit. It does this by monitoring available power and communicating control information to compatible chargers, not by carrying the charger power through the hub. For installers designing larger commercial EV charger layouts, that separation matters because power circuits, protection and communication wiring each need to be planned correctly.

CT clamp siting and cable limits

The installation guide states that the balancer enclosure is suitable for internal installations only and should be installed close to the incoming power or the EV circuit being monitored. CT clamp cables should not be extended beyond 50m, so the enclosure position needs to be chosen before the CT routes are finalised. On three-phase installations, that planning is especially important because all three phase measurements need to be installed and checked correctly.

CT orientation should be verified during commissioning. The installer app allows current and voltage readings to be checked, helping confirm that the CT clamps are in the correct location and direction. The guide also notes that negative values can indicate reverse power direction, for example from solar surplus, or a reversed CT clamp, so readings should be interpreted in the context of the actual site load.

RS485 connection to compatible chargers

The balancer connects to chargers by RS485. The communication cable from the balancer to the last connected charger can be up to 150m, and chargers can be wired in a loop or connected back to the hub. Correct polarity is required at the hub and at each charger.

The connected EV chargers need balancer multi-charger management enabled during setup. If a charger loses communication with the hub, it shows a balancer communication fault and falls back to a 6A maximum charge rate. That fallback current means the system has a defined response to communication loss, but the installation must still be designed so the charger circuits and supply are suitable for the number of charge points fitted.

Choosing EVAB1ETP400 or EVAB1ESP120

EVAB1ETP400 is the three-phase package with three 400A CT clamps. EVAB1ESP120 is the single-phase package with one 120A CT clamp. EVAB1D is the hub only version for integration into existing panel boards where accessories are sold separately. Choose the 400A kit only when the site needs three-phase load measurement, because a single-phase installation gains no benefit from buying the larger CT package.

Both enclosed kits are listed with IP20 housing and are for internal installation. The enclosure includes the hub, MCB and wiring terminals, reducing specification work compared with the hub only option. Complementary load management and charger accessories can be found under LAMPS EV ancillaries.

EVAB1ETP400 questions installers ask

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