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Appendix A Specifications
Specifications are @ 25°C unless otherwise noted and are subject to change without notice.
System Ratings
Storage ambient –40°F to 185°F (–40°C to 85°C)
Approvals CSA C/US, Factory Mutual
Classification • Cl I, Div 2, Grp A,B,C,D and Ex nA IIA, IIB, IIC (Zone 2)
• SSR Version T-code: T4 (T3A with optional pilot light)
• Ordinary locations (SSR and contactor versions)
920 Series Wiring Terminal Ratings
Terminal board 28-12 AWG, strip length: 0.22"
Switch interface 28-14 AWG, strip length: 0.33"
Power terminals 30 A: 22-8 AWG, strip length: 0.47", torque: 16.0 lb-in
60 A: 14-6 AWG, strip length: 0.47", torque: 26.5 lb-in
920 Series Control Module (per control point)
Operating temperature –40°F to 140°F (–40°C to 60°C)
Power requirement 9 Vdc nominal, 600 ma maximum
Control modes Proportional, deadband, proportional ambient (SSR), propor-
tional ambient (contactor) modes, adjustable 2°F to 90°F
(1°C to 50°C) above setpoint
Temperature inputs (2) RTD inputs: 3-wire 100
Ω Platinum (DIN 43760,
α=0.00385Ω/Ω/°C) or 2/3-wire 100Ω Ni-Fe, open/shorted
sensor detection/protection, lead resistance compensated 0 to
20
Ω per lead.
Temperature measurement range –76°F to 1058°F (–60°C to 570°C), accuracy: ± 0.5% of span
± 1LSD
Voltage measurement range 50 to 295 Vac (with voltage turns ratio @ 1:1), accuracy: ± 1%
of span ± 2LSD, repeatability: ± 1.5% of span
Current measurement range 0.3 to 100 A (with current turns ratio @ 1:1), resolution: 0.1 A
(0.3 to 11 A range), 0.3 A (11 to 40 A range), 0.7 A
(40 to 100 A range), accuracy: ± 2.5% of reading ± resolution,
repeatability: ± 3% of reading ± resolution
GF current measurement range 20 to 250 ma, accuracy: ± 2.5% of span ± 2 LSD at nominal
load, repeatability: ± 4% of span
Alarm relay output Dry contact, 48 Vac/dc, 500 ma, 10 VA switching maximum
920 Series SSR Switch Interface Module
Operating temperature –40°F to 140°F (–40°C to 60°C)
Power requirements 100 to 277 Vac nominal, 1 PH, 60 Hz ±3 Hz or 50 Hz ±2 Hz,
100 ma. maximum
Output power +9 Vdc nominal, 650 ma maximum
SSR drive +9 Vdc nominal, 75 ma maximum
Current sense range 1000:1, 0.3 to 60 A, 50/60 Hz, 1 PH
GF current sense range
1000:1, 20 to 250 ma, 50/60 Hz, 1 or 3 PH
Wiring terminals 28-14 AWG, strip length: 0.33"
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