Server Technology STV-4523C Switched 0U Rack PDU with Per-Inlet Power Sensing

Overview

The STV-4523C is a 0U vertical switched PDU from the PRO2 line, built for data center racks that need outlet-level control plus real per-inlet metering rather than a single aggregate reading. It ships with 48x IEC C13 outlets on a single 415V Wye input, rated for 11.5kW at 16A, and is designed to mount in the rear rail space of a cabinet without consuming any U space usable for servers or network gear. If you're populating a high-density rack and need both remote outlet cycling and branch-level current visibility on one strip, the STV-4523C is built for exactly that job.

Key Features

• Per-Inlet Power Sensing (PIPS): Monitors current (A), voltage (V), power (W), apparent power (VA), crest factor, power factor, and energy at the inlet — ±1% accuracy on current, voltage, active power, and apparent power. That level of precision matters when you're billing colocation tenants or validating capacity planning against actual draw instead of nameplate estimates.
• 48x IEC C13 Outlet Control: Switch power to individual outlets or groups from the network interface — reboot a hung server remotely instead of walking the data center floor, or power down unused receptacles to cut idle draw.
• Branch Circuit Protection (UL489): 1-pole, 20A magnetic-hydraulic breakers protect each branch and meet the UL/IEC 62368-1 branch circuit protection requirement — a breaker trips locally on an overload instead of taking down the whole PDU.
• Branch Current Monitoring with SNMP Alerts: Tracks current at each breaker branch and fires SNMP-based alerts and emails before a branch trips — useful when you're load-balancing across three phases in a dense cabinet and want a warning before a breaker opens mid-shift.
• Auto-Flip LED Current Display: Three LEDs cycle per-phase current readings at the unit itself, so a tech standing at the rack can check load balance without pulling up the web interface.
• Hot-Swap Network Card with Star Multi-Linking: PRO2 links up to four power circuits under one IP address, and the Expansion unit keeps network access alive if the Primary loses power — a single management IP covers the whole linked group instead of four separate logins.
• 415V Wye 3P+N+G Input, 20A IEC 60309: Matches standard European/international 3-phase distribution and delivers 11.5kW of usable capacity to the strip — sized for dense server or switch rows where a single-phase PDU would run out of headroom.
• Ethernet 10/100/1000 Mbps + RS-232 Serial: Manage over HTTP(S), SSH, Telnet, SNMP, (S)FTP, SMTP, Syslog, or LDAP(S) — fits into an existing out-of-band management network without a proprietary tool.
• Temperature/Humidity Probe Support: Connects two external 10' (3m) T/H probes with SNMP alerting — extends environmental monitoring to the rack itself, not just the room-level CRAC sensor.
• Wide Operating Range: Rated 0°C to 60°C and 8–90% RH operating, with storage down to -40°C — the 60°C ceiling gives headroom in hot aisles or edge enclosures that run warmer than a standard data hall.
• High-Retention Locking Outlets: C13 receptacles are compatible with P-Lock type power cords for higher retention — worth specifying if the rack sees vibration or frequent cable moves and standard C14 cords have worked loose before.

Integration & Compatibility

At 69.0in x 3.25in x 2.25in, the STV-4523C mounts vertically in 0U rear-rail space, keeping all 48 outlets accessible without displacing any front-facing rack units. It pairs naturally with network video recorders or dense switch stacks where per-device power cycling saves a truck roll, and fits into broader PDU and power distribution planning for a cabinet. For guidance on sizing PDU capacity and outlet count against a planned rack load, see the internal PoE and power planning guide. Server Technology's PDU catalog includes higher-density and lower-outlet-count variants within the PRO2 and PRO3X lines if 48 outlets is more or less than the deployment calls for. STV-4523C (often searched as STV 4523C) integrates over standard SNMP MIBs, so it drops into existing DCIM and network monitoring tooling without a proprietary agent.

Frequently Asked Questions

Q: How many outlets does the STV-4523C have and what type?

A: 48x IEC C13 outlets on a single 0U vertical strip.

Q: What input power does the STV-4523C require?

A: 240/415V Wye, 3P+N+G, 20A via IEC 60309 6Hr connector, rated 16A input current and 11.5kW capacity.

Q: Does the STV-4523C monitor power at each inlet or just the whole unit?

A: It uses Per-Inlet Power Sensing (PIPS), measuring current, voltage, power, apparent power, crest factor, power factor, and energy at each inlet, with ±1% accuracy on current, voltage, and active/apparent power.

Q: Can I remotely reboot individual servers connected to the STV-4523C?

A: Yes — it's a switched PDU, so outlets or outlet groups can be cycled remotely to reboot connected equipment.

Q: What management protocols does the STV-4523C support?

A: HTTP(S), SSH, Telnet, SNMP, (S)FTP, SMTP, Syslog, LDAP(S), and RS-232 serial, over a 10/100/1000 Mbps Ethernet interface.

Q: What's the operating temperature range for the STV-4523C?

A: 0°C to 60°C operating, with 8%RH to 90%RH humidity; storage range is -40°C to 85°C.

James Everett

What stands out on the STV-4523C is the ±1% measurement accuracy on inlet current, voltage, and active/apparent power — that's PIPS doing real per-inlet metering, not a single averaged reading pushed across 48 outlets. On a strip this dense, that precision is the difference between guessing at branch load and actually knowing it.

Technical Highlights:

• 11.5kW at 16A on 415V Wye: Sized for a 3-phase feed, giving real headroom over a single-phase 208V strip in the same footprint — worth checking against your panel's available 3P+N+G capacity before ordering.
• UL489 branch circuit breakers, 1-pole 20A: Each branch trips independently on overload, so one overloaded group of outlets doesn't take the whole 48-outlet strip down.
• Branch current monitoring with SNMP alerting: Flags high branch usage before a breaker trips — set thresholds early if you're balancing load across phases in a dense cabinet.

Deployment Considerations:

• This is a 0U vertical unit at 69.0in x 3.25in x 2.25in — plan rear rail clearance in the cabinet before ordering, since it doesn't consume front U space but does need depth.
• The IEC 60309 3P+N+G input plug requires a matching 415V Wye receptacle — confirm your facility's panel wiring supports this before specifying the STV-4523C over a 208V single-phase alternative.

The STV-4523C fits a colocation or hyperscale row where tenants are billed on measured draw and operators need branch-level alerting ahead of a trip — 48 C13 outlets on one 3-phase drop covers a fully populated server row without a second PDU.