4P 40 A 30 mA differential circuit breaker, AC type

4P 40 A 30 mA differential circuit breaker, AC type

4P 40 A 30 mA differential circuit breaker, AC type from stock PVGroup.plThis is inventory left over from completed projects—brand new goods, sold while supplies last.

The most important features

• Standard (EU declaration of conformity): PN-EN 61008-1:2012 (EU declaration of conformity No. 5.11.2020, VCX Sp. z o. o., TYPE/MODEL: SR6HM, Krakow 25.11.2020)
• Rated current: 40 A.
• Differential current: 30 mA
• Number of poles: 4P
• Type: AC
• Brand new product from stock, sale while supplies last

Application

A component of a photovoltaic installation. Detailed selection for a specific project is made by the installer based on the device documentation and installation conditions.

Technical Specifications

Application in a photovoltaic installation

The circuit breaker type is selected based on the type of current that can occur in the circuit due to insulation damage, not the power rating of the load. Type AC responds exclusively to alternating current and is sufficient for purely resistive circuits—lighting, general-purpose sockets, and heaters. Type A also detects unidirectional pulsating current, which occurs wherever a rectifier operates in the load: switched-mode power supplies, electronic washing machines and dishwashers, and inverter controllers. In new residential installations, type A is now the default choice, as virtually every larger load incorporates a rectifier.

In a photovoltaic installation, there's another criterion. The inverter's connection circuit on the AC side is protected by a device appropriate to the inverter's design: some devices have a built-in DC control system and the manufacturer's manual allows for type A, while others require type B. The manual for the specific inverter is the deciding factor, not a general rule. It's worth consulting it before making a selection, as errors in this area can be detected only during system acceptance.

The second parameter is the differential tripping current. A value of 30 mA provides additional shock protection—socket and touchable receiver circuits. The 100 mA and 300 mA values ​​are used for fire protection and are used in power supply circuits where tripping at 30 mA would result in disconnections from natural leakage currents. When multiple devices are connected in series, selectivity is important: the element closest to the receiver has a more sensitive threshold than the primary element; otherwise, a failure in one circuit will extinguish the entire switchboard.

The rated current of the device does not protect the circuit against overload. A residual current device without an overcurrent protection element must be protected by a separate overcurrent circuit breaker with a current rating no greater than the device's rated current. Therefore, it is selected with a value equal to or greater than the sum of the fuses of the circuits it protects.

4p 40a differential circuit breaker - what to pay attention to when choosing one

When purchasing this item, check three things: compatibility with existing equipment on site, site conditions, and the quantity needed for the entire project. Photovoltaic system components operate outdoors for several years, in full sunlight and with fluctuating temperatures, so the choice of material and workmanship is crucial to the durability of the entire installation.

If you are collecting material for a specific installation, it is more convenient to take everything from one delivery - the remaining items from the same group can be found in the protection and disconnectors category , and all excess stock in the Inventory category.

Where does this stuff come from?

We sell inventory left over from closed projects and deliveries. The merchandise is brand new and covered by the same returns and refunds policy as the rest of our offerings. The only difference is that quantities are limited and will not be restocked—once the stock is depleted, the item will be removed from the store.

Minimum order and price calculation method

This item is sold individually, with no minimum order requirement—the price listed is for one item, and that's how many you can buy. Stock is limited to what's left in stock after closed projects, so if you have a high demand, please check availability before ordering—we don't restock these batches.

Prices in the store are given in net and gross amounts, and logged in wholesale customers can also see their discount.

Delivery and pickup

Orders are shipped from our warehouse. Shipping costs depend on size and weight—small items are shipped as a parcel, while items longer than a standard parcel require pallet shipping, which is visible in the shopping cart after adding items. For orders with multiple items, shipping costs are calculated once for the entire shipment, so collecting the materials for a single order is cheaper than shipping several items separately.

You can also collect the goods in person at our warehouse in Bytomiu — pickup is free. For low-value items, this is often the most reasonable option, as shipping costs can be as high as the order itself. It's worth confirming availability before arrival, especially for last-minute items.

Frequently Asked Questions

What type of circuit breaker is used with a PV inverter?

The type of RCD selected depends on the inverter documentation and installation design. Check the inverter manufacturer's requirements—some devices require a specific type.

Can I collect the goods in person?

Yes, personal collection in Bytomiu is free—you select it in your cart. For small items, this is often the most reasonable option, as shipping costs can be as high as the value of the item itself.

How many pieces are available?

This is a surplus stock item – quantities are limited and displayed next to the product. Once stocks are depleted, the item will be removed from the offer.

Will I receive a VAT invoice with my order?

Yes. We sell on a B2B basis - after logging in, you'll see net prices specific to your group.