UNIV 3.2.5.x - Allowed Load and Protection

[Alexandre]

Hi, I have some doubts regarding the UNIV 3.2.5.x module. According to the relay datasheet, the relay can drive 6A, and the maximum peak current is 10A. Also, it states that the rated load is 1500VA for AC1 and 300VA for AC-15. According to the application note, the module is protected with a circuit breaker of 6A. Can I use a 6A circuit breaker with C curve for protecting this module? Do I need an additional 10A fast acting fuse to protect this module after the circuit breaker? In practice, can I use this module to drive Fluorescent lamp or LED bulbs? If so, what would be the maximum allowed load in VA not to harm the relay?

[Jacek]

The nominal relay current of UNIV 3.2.5.x module is 6A, and its nominal voltage is 250V which allows to drive 1500VA loads.
The circuit breaker must be chosen according to the circuit nominal current - 6A.
If you connect capacitive loads, you can expect inrush current, which can be around 40-80A. It depends on load. The relay we're talking about may not be sufficient for that, as its inrush current is only 10A.
When we talk about inrush current I mean current peak which takes up to 20ms. The 6A circuit breaker with B characteristic switches off within 100ms if its current goes above 30A. It means that this ciruit breaker can not protect your relay against inrush current. Using circuit breaker with C characteristic is even worst.
You should consider using relay specially design for handling inrush current around 100A (modules UNIV 3.2.3.x or UNIV 3.2.4.x)