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1-4 BE1-50/51B-218/-228 General Information 9252000995 Rev G

Table 1-3. Time Characteristic Curve Constants with SW3-3 Closed (On)

Curve Type ∗

Constants

BE1 Similar To

Figure

Number †

A B C N K R

S GE IAC 55 A-10 0.0286 0.0208 1.000 0.9844 0.028 0.0940

L GE IAC 66 A-11 2.3955 0.00002 1.000 0.3125 0.028 7.8001

D ABB CO-6 A-3 0.4797 0.21359 1.000 1.5625 0.028 0.8750

M ABB CO-7 A-4 0.3022 0.12840 1.000 0.5000 0.028 1.7500

I GE IAC 51 A-12 0.2747 0.1042 1.000 0.4375 0.028 0.8868

V GE IAC 53 A-13 4.4309 0.0991 1.000 1.9531 0.028 5.8231

E GE IAC 77 A-14 4.9883 0.0129 1.000 2.0469 0.028 4.7742

B BS142-B ‡ A-8 1.4636 0.00000 1.000 1.0469 0.028 3.2500

C BS142-C ‡ A-9 8.2506 0.00000 1.000 2.0469 0.028 8.0000

F None § N/A 0.0000 1.00000 0.000 0.0000 0.000 1.0000

Notes for Tables 1-2 and 1-3

∗ BE1 Curve Types: S: Short Inverse V: Very Inverse

L: Long Inverse E: Extremely Inverse

D: Definite Time B: BS142 Very Inverse

M: Moderately Inverse C: BS142 Extremely Inverse

I: Inverse F: Fixed Time Delay

† Figure numbers refer to the characteristic curves located in Appendix A, Time Characteristic Curves.

‡ Curves B and C are defined in British Standard BS142 and IEC Standard IEC 255-4.

§ Fixed time delay, adjustable from 0.1 to 9.9 seconds.

Integrating Reset

Reset begins when the current drops below 95% of pickup. Integrating reset simulates the disk reset of

electromechanical relays. BE1-50/51B-218 and BE1-50/51B-228 relays provide the integrating reset

function even when input current falls to zero.

Integrating reset characteristics are defined by the following equation and shown in Figure 1-1. Equation

constants are provided in Tables 1-2 or 1-3.

Integrating Reset Equation:

−

Where:

= Time to reset in seconds

R = Constant for the particular curve

D = TIME DIAL setting

M = Current in multiples of PICKUP setting during reset

Basler BE1-50/51B-218 User Manual

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