Appendix A Technical Specifications
PM135 Powermeter Series 143
A.4 Input Ratings
Voltage Inputs – Installation category III
Operating range: 690VAC line-to-line, 400VAC line-to-neutral
Direct input and input via PT (up to 828VAC line-to-line, up to 480VAC line-
to-neutral)
Input impedance: 1000 k
Burden for 400V: < 0.4 VA
Burden for 120V: < 0.04 VA
Over-voltage withstands: 1000 VAC continuous, 2000 VAC for 1 second
Wire size: up to 12 AWG (up to 3.5mm2)
Current Inputs (via CT) – Installation category III
Wire size: 12 AWG (up to 3.5 mm2)
Galvanic isolation: 3500 VAC
5A secondary (standard)
Operating range: continuous 10A RMS
Burden: < 0.2 VA @ In=5A (with 12AWG wire and 1 m long)
Overload withstand:
15A RMS continuous, 300A RMS for 1 second (with 12AWG section wire)
1A secondary (option)
Operating range: continuous 2A RMS
Burden: < 0.02 VA @ In=1A (with 12AWG wire and 1 m long)
Overload withstand:
3A RMS continuous, 80A RMS for 1 second (with 12AWG section wire)
40mA secondary – External Solid or Split core CT (option)
External CT Operating range: continuous 10, 100-1200A RMS
Burden: < 0.02 VA @ nominal current
Sampling Rate measurement
128 samples/cycle
A.5 Optional Relay Outputs
Electromechanical relay - DRY contact, option (4DI/2DO or 12DI/4DO
Optional module)
2 or 4 relays rated at 5A/250 VAC; 5A/30 VDC, 1 contact (SPST Form A)
Galvanic isolation:
Between contacts and coil: 3000 VAC 1 min
Between open contacts: 750 VAC
Operate time: 10 ms max.
Release time: 5 ms max.
Update time: 1 cycle
Wire size: 14 AWG (up to 1.5 mm2)
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