Question 1

Is the metal inside the connectors aluminum or copper and if they are aluminum would that be an issue with safety?

Accepted Answer

From the data sheet: 
Contact Materials
Hard and extra-hard electrolytic copper(ECu), as well as extra-hard copper alloys arethe standard materials used for the current-carrying parts of all WAGO products.  These materials combine excellent conductivity and good chemical resistance without the risk of stress-induced cracking. 
 
Contact Materials
The special tin layer, which is the standard layer for all current-carrying parts in WAGO products, ensures perfect long-term protection against corrosive substances. Furthermore, these layers provide a gas-tight contact that ensures a durable transition resistance. At the clamping unit, the conductor is embedded into the soft tin layer via high contact pressure. This protects the contact area against corrosion. The thick tin layer also ensures good solderability of both PCB terminal block and connector solder pins.

Clamping Spring Material
Every WAGO clamping spring is made of high-quality, accurately tested austenitic chrome nickel steel (CrNi) with high tensile strength, which boasts proven corrosion resistance through long-term usage. It is resistant to sea spray, city pollutants and industrial emissions (e.g., sulfur dioxide, hydrogen sulfie). At room temperatures of approximately 20°C (68°F), the material is resistant to salt solutions up to 30% and dilute phosphoric acids
up to 30%. Even after decades of use, no galvanic corrosion between the chrome nickel spring steel (in connection with the contact materials used by WAGO) and the connected copper conductors has been detected.
The relaxation of the material as a function of time and surrounding temperatures up to 105°C (221°F) can be ignored. Samples loaded with 500 N/mm² at a temperature of 250°C (482°F) showed a relaxation of only 1.5%.
In certain product lines, the clamping springs are thermally treated at temperatures between 350°C (662°F) and 420°C (788°F) after production. This treatment reduces internal stress due to the material’s mechanical deformation, which may result in a slight brown discoloration of the spring surface. WAGO only accepts deliveries of chrome nickel spring steel against certifiates of conformity and after select material tests have been performed.

Question 2

will these fit in a 3/4" hole?

Accepted Answer

No. Wago 221-413 size : 18,8mmX 8,4mm . Minimum hole size : 13/16”

Question 3

cuantas unidades trae el paquete?

Accepted Answer

50 pieces

Question 4

would these be safe to use inside a toaster?

Accepted Answer

Wiring inside a heating device is usually rated for 105 degrees C.  I doubt these are rated for that temperature.  They might be rated for the normal wire temp of 75 degrees C or so.

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WAGO221-413 Lever-Nuts 3 Conductor Compact Connectors 500 PK

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