3 pins digital switch component for an Arduino project
You want to use 74HC4066 , if you need single switch elements. You must have a high value pullup R on SCL at each chip e.g 100k

You might prefer to use a multiplexor like 74HC4051,2,3.

If you use a mux, then only one of n can work at once. If you use 4066s, then you can connect all or one. Sometimes you want to do this, as you can write to multiple chips which have the same address (e.g to initiate ADC read), but you can only read from one at a time.

If you use 74HC4052, you can switch both SCL and SDA. This is not needed for your basic task of muxing the I2C bus to 4 chips which are on the same pcb.

If you had more chips, or if one of the segments was on a long cable, or likely to have faults, then switching both lines keeps the C down, the timing matched between SDA and SCL, and can isolate a faulty segment allowing the rest of the sytem to operate.



Now, you can also use a dedicated I2C mutliplexor like this , but just because chip makers produce chips, doesn't mean they are advantageous to you. Using ordinary cmos switches or muxes is


electrically just fine, zero problems
cheap
uses a standard part that is useful for other things
control is not over the same bus, so it cannot be blocked by an I2C bus fault. (sec 3.1)


I2C switches have some advantages


level shifting function
can be ganged up to make enormous multiplexor arrays
don't need extra control lines from your micro - good for external expansion modules like this 




Lastly a simple N-fet would also work. (Source to master SCL, Drain to slave, 100k pullup at slave). It doesn't isolate capacitances very well, but again, not an issue for 4 chips on one pcb.