Relay/Transformer (R/T Box)
Standard Transition
Each Entelli-Switch 250 microprocessor based ATS
controller requires a relay/transformer box to apply line
voltage to the ATS operator via coil control relays. Also
required is power for the Entelli-Switch 250 printed circuit
board and an application of sensing voltage proportional
to line voltage. This is accomplished by the relay trans
-
former box. This method of switching operator voltage
and applying power and sensing voltage to the printed
1
2
(inside)
3
Figure 12
circuit board isolates the MX250 from the line voltage,
further protecting the controller from harmful line tran
-
sients. Two versions of the R/T box exist depending on
the type of A
TS (standard transition or delayed transition).
The following layout drawings of the R/T Box compo-
nents (standard and delayed transition) include a bill of
materials for replacement parts. Schematics are included
to indicate proper wiring.
1
2
3
Figure 13
40-225 Amp Molded Power Section
40-3000 Amp - All Other Standard Types
Transformer Usage (see Figure 12)
Transformer Usage (see Figure 13)
R/T Box Primary 1 VA 25 VA
Assembly Voltage XFMR XFMR
Part No. at 50/60 Hz Part No. Part No.
57P-1015 120V K-3216 K-3224
57P-1016 208-220V K-3217 K-3225
57P-1017 230-240V K-3218 K-3226
57P-1018 277V K-3219 K-3227
57P-1019 380-400V K-3220 K-3228
57P-1020 416-440V K-3221 K-3229
57P-1021 460-480V K-3222 K-3230
57P-1022 575-600V K-3223 K-3231
R/T Box Primary 1 VA 25 VA
Assembly Voltage XFMR XFMR
Part No. at 50/60 Hz Part No. Part No.
50P-1026 120V K-3216 K-3224
50P-1027 208-220V K-3217 K-3225
50P-1028 230-240V K-3218 K-3226
50P-1029 277V K-3219 K-3227
50P-1030 380-400V K-3220 K-3228
50P-1031 416-440V K-3221 K-3229
50P-1032 460-480V K-3222 K-3230
50P-1033 575-600V K-3223 K-3231
Bill of Material
Bill of Material
Item Part No. Description Qty
1 See Chart Transformer (1 VA) 2
2 See Chart Transformer (25 VA) 2
3 K-1274 Relay Flange Mounted 2
Item Part No. Description Qty
1 See Chart Transformer (25 VA) 2
2 See Chart Transformer (1 VA) 2
3 K-1260 Coil Control Relay (24V) 2
GE Zenith Controls
ZTS / ZTSD Operation and Maintenance Manual (71R-3000)
21
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