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All you need to know about bell transformers
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What was a bell transformer?
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How does a bell transformer work?
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Connecting the transformer (surface-mounted)
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Replacement of a bell transformer
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Questions and answers
What was a bell transformer?
The word "bell transformer" stands for the bell transformer. This, as its name suggests, transforms tensions. Thus, a mains voltage of 230 V can be converted into lower voltages in order to operate door signal systems with the appropriate mains voltage. This includes, on the one hand, the door bell , on the other hand, the electronic gong, the buzzer in the case of electric door openers or the intercom system.
Important: Voltages of 3, 5 or 8 volts should be achieved by transformers. This voltage requires electrical bells and similar compact signaling systems.
How does a bell transformer work?
A circuit must be provided for the installation and operation of a door bell, a door buzzer or similar equipment. This runs from the bell transformer to the button on the door, which in turn is connected to the bell itself. The door bell is also connected to the transformer. As soon as the doorbell button is pressed, the power circuit closes. As a result, the gong can ring or the buzzer can sound – and the visitor can notice.
Connecting the transformer (surface-mounted)
Most electrical bells require a low voltage of only 8 volts. You can achieve this by installing the bell transformer.
On one side of the bell transformer there is a normal mains connection, which is operated with 230 V. Therefore, such a transformer always requires a mains plug or is mounted via a fixed connection. For this purpose, lay a cable, the output side of the transformer has only a few volt alternating voltage, usually 3, 5, 6, 8 or even 12 volt. The doorbell is connected here.
Practical tip
You can use a special mounting kit, as shown in Figure 2, to convert a doorbell transformer for the DIN rail into a surface mounted bell transformer. Of course, we have such a set.
Replacement of a bell transformer
An AP bell transformer can be mounted relatively easily. We will show you the four steps required to enable the correct commissioning. Work on the domestic installation may only be carried out by a specialist or person familiar with the relevant safety regulations.
1. Switch off the power: It is important that the power is switched off before installation. To do this, look at the fuse or press the main switch.
2. Preparing the connection: Prepare the connection by loosening the top and bottom cover with a flat screwdriver. To do this, turn the plastic screws until they can be removed.
3. Surface mounting: Now the bell transformer is used. This is fixed by using the screws and dowels provided. Four holes on the bell transformer are intended for mounting. These are located in pairs at the top and bottom. The transformer is mounted on the distribution rail in the electrical distributor.
Good to know: There are also variants for flush mounting. Then the bell transformer is hidden in the flush-mounted. The installation is usually somewhat more extensive. If you have any questions, please contact our service department.
4. Connecting the transformer: The bell transformer has two main cables. These are connected to the lower 220/240 V~ terminals, while the bell wires are connected to the upper 8 V~ terminals. Now the cover is fixed, the power is switched on and the bell is ready for operation.
Questions and answers
Where is the bell transformer connected?
The transformer works electronically and should be connected to the sub- or main distributor. If it is subsequently mounted, an AP bell transformer (in the surface) is recommended. This is attached next to the bell. A transformer can also be connected to a 230 V socket, but then needs a cable and of course a mains plug.
What is the power consumption of a transformer?
The power consumption is usually negligible, but cannot be fixed at a flat rate. Normally, the consumption is indicated on the device, for example on the packaging or in the instructions for use. Power consumption may increase per ring operation.
Is a bell transformer short-circuit proof?
Yes, a bell transformer must be obligatory short-circuit proof. Depending on the model, the secondary side of the transformer ensures maximum short-circuit protection. Normally, however, even after a short circuit that cannot always be avoided, the restart can be carried out without any problem.
Can a bell transformer be retrofitted?
Yes, but then only on the DIN rail or in the AP. There are transformers, for example, that have two or more different voltage outputs and are therefore suitable for many gongs and subsequent installation.
What extras are available for the transformer?
Depending on the model, several alarm bells can be operated at the same time. Some bell transformers can also be purchased with a separate switch or as a sealable version. You can find these extras – if available – directly in the product description.