THE SUN PROVIDES ENERGY, PROVIDES SAFETY

IN MOST PHOTOVOLTAIC SYSTEMS, THE DC ISOLATOR IS INTEGRATED INTO THE DC/AC

POWER INVERTER. AFTER SWITCHING OFF THE DC ISOLATOR, THE CABLES BETWEEN THE DC SOLAR

MODULES AND DC/AC POWER INVERTER RUNNING

THROUGH THE BUILDING ARE STILL SUBJECT TO UP TO 1000 V DC. IN THE EVENT OF A FIRE, FIREFIGHTERS ARE

EXPOSED TO A VERY SERIOUS SOURCE OF POTENTIAL DANGER. THE Aswich DOMESTIC FIREFIGHTER

SAFETY

SWITCH (ERS) PROVIDES THE SOLUTION. IT DIRECTLY DISCONNECTS

THE DC CURRENT IN CLOSE PROXIMITY TO THE SOLAR MODULES AND CREATES A SAFER SITUATION FOR

FIREFIGHTERS.

1 MANUAL AC POWER SHUT DOWN

2 AUTOMATIC DC POWER SHUT DOWN

String / lead cable +

String / lead cable –

AC circuit

AC POWER SHUT DOWN = DC POWER SHUT DOWN

The first step for any firefighter in fighting a fire is to shut down the main AC power circuit. This

makes it possible to start extinguishing the actual fire without the risk of electrocution. Aswich

developed the Domestic Firefighter safety Switch according to this standard international safety

routine. This prevents firefighters from having to take any extra action in case of a fire, maximizing

their and your safety in the event of a fire.

As soon as a firefighter shuts down the main AC circuit, the ERS will detect this. If this power down

situation lasts, the ERS will automatically switch to the OFF position in 5 seconds. Since the ERS is

located close to the PV modules, the high voltage DC current from the PV modules will be

completely isolated, which leaves a safe situation for the firefighters when fighting a fire in the

house.