PTB (Siemens stock no. 500-033390) is the Power Termination Board for the PSC-12 power supply charger and PSX-12 power supply extender. It filters incoming AC mains and distributes it to the PSC-12 and an optional PSX-12, with an AC-line filter and a 5 A AC-line breaker. Each PTB supports the AC connections of two power supplies; the PSC-12 and PSX-12 each come with a PTB.
Specifications
| Terminal blocks |
TB1 AC main input; TB2 AC output to next PTB |
| Connectors |
P1 laptop power (AC adapter P/N 500-633992 required); P2, P3 factory; P4 and P5 to PSC-12 or PSX-12 |
| AC line protection |
AC-line filter and 5 A AC-line breaker |
| AC mains rating, each PSC-12/PSX-12 |
3.5 A max. at 120 VAC; 2.5 A max. at 220 VAC; 2.0 A max. at 240 VAC; 50/60 Hz |
| Second-PTB wiring |
14 AWG minimum, 10 AWG maximum |
Compatibility and installation notes
- Mounts on threaded studs in the lower part of a CAB enclosure, secured with four #10 hex nuts. One PTB fits a CAB-1; one or two fit a CAB-2BB/-RB or CAB-3BB/-RB.
- Each PSC-12 or PSX-12 must sit in the row and position directly above the PTB that feeds it, joined by the 12-inch AC cable to P4 or P5.
- Hot to TB1-1, neutral to TB1-2; the green earth wire goes to the earth ground lug directly below the PTB.
- P1 carries mains voltage; a short there can shut down the panel AC connection.
- Siemens data sheet 7322 says a second PTB is needed when more than one PSX-12 is used, while its ordering table says only with more than two PSX-12s. Plan by connections: each PTB feeds two supplies.
Documents
Specifications from Siemens Installation Instructions Model PTB, P/N 315-034877-4, and Siemens Data Sheet 7322 (April 2023). Manufacturer specifications are subject to change.
