Charging stations (EVSE)

isoEV425

Bender offers a variety of electrical safety relay solutions for EV charging stations. Our components are designed to be integrated with the EVSEs electronic controls. Here, they make sure that electrical isolation hazards or dangerous milliamp currents cannot harm personnel or the EVSE itself. They are designed to sense and then alert at predetermined thresholds. As follows, power will always be interrupted before the situation becomes worse. The following paragraphs describe the individual solutions we carry for level 1, level 2, and DC fast charging stations. Since there is a variety of charging solutions out there, different safety circuits may apply and we have compiled the information below to address each scenario.

Charging Cable (IC-CPD)

Charging cable (IC-CPD)

Level 1 AC charging allows the user to charge their vehicle with a normal outlet at home, but also requires a special charging cable. This charging cable must have an integrated monitoring system capable of triggering a 6 mA ground fault. These are known as charge current interrupting devices or CCID5. Bender offers ground-fault monitoring sensors for level 1 charging cable manufacturers (level 1 GFCI). These CCID sensors can be used in EVSE cords in accordance with UL 2231 which has several Bender listed devices.

AC Charging

AC Charging

Level 2 EVSE (electric vehicle supply equipment) can be found at homes, in hotels, or at the workplace. The required infrastructure for these charge ports is relatively simple and usually requires only a 120V or 240V connection. Bender's RCMB level 2 ground fault sensing devices monitor circuits effectively for fault currents that can pose hazards to personnel and equipment. These leakage devices are listed to UL2231 and fulfill all the stringent safety requirements. They will trigger at either 5 or 20mA of potential hazard current and interrupt the EVSE.

DC Fast Charging

DC charging column

DC charging allows vehicles to be charged quickly at significantly higher powers. A DC charging station, also called a fast charging station, is usually set up as an ungrounded power supply system, which must be monitored by an insulation monitoring device as specified by the standards.

In DC charging, a distinction is made between two common charging standards. In addition to the CCS standard (Combined Charging System) used in US and Europe, the Japanese charging standard CHAdeMO is also used for some vehicles from Asian manufacturers.

The new insulation monitoring device ISOMETER® isoCHA425HV with AGH420 supports both charging standards equally. With this combination unit, Bender has now responded to the demands of the market.

It allows switching online between CCS and CHAdeMO via a galvanically isolated Modbus RTU interface. The individual parameters for the respective standard are pre-programmed and can be selected automatically. The device is designed for nominal voltages of up to 1,000V and thus already takes into account the increasing battery and charging voltages.

Recommended systems for ground-fault monitoring (grounded systems):

Recommended Smart-Grid Charge Controller:

Recommended systems for ground-fault detection (ungrounded systems):

IEC 62752
IEC 61851-xx
DIN EN 62752
SAE J1772
UL 2231-1
UL 2231-2
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