Enter the length (m), the resistance (ohms), and the current (amps) into the Relay Burden Calculator. The calculator will evaluate the Relay Burden. 

Relay Burden Formula

The following formula is used to calculate the Relay Burden. 

RB = I^2*2*D*R


  • Rb is the Relay Burden (volts)
  • D is the length (m) 
  • R is the resistance (ohms) 
  • I is the current (amps) 

How to Calculate Relay Burden?

The following steps outline how to calculate the Relay Burden.

  1. First, determine the length (m).
  2. Next, determine the resistance (ohms). 
  3. Next, determine the current (amps). 
  4. Next, gather the formula from above = RB = L^2*2*D*R.
  5. Finally, calculate the Relay Burden.
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

length (m) = 50

resistance (ohms) = 20

current (amps) = 3

RB = I^2*2*D*R =  ?