Server Technology STV-4523K Switched Rack PDU

Overview

The Server Technology STV-4523K is a switched rack power distribution unit built for 3-phase data center deployments that need per-outlet control across a dense outlet count. It runs on a 230/400V Wye 32A IEC 60309 3P+N+PE input, delivers up to 22.0kW of capacity, and distributes power to 48 IEC 60320/C13 outlets — the outlet density a full or near-full server cabinet needs without daisy-chaining a second strip. At 69.0in tall, 3.25in wide, and 2.25in deep, it's a zero-U vertical mount that runs the full rack height in the side channel, keeping outlets accessible without eating into front or rear U space reserved for compute and network gear.

Key Features

• 48x IEC 60320/C13 Outlets: enough outlet count to power a fully loaded rack of servers, switches, and blade chassis from one unit — fewer PDUs to mount, wire, and monitor per cabinet.
• 22.0kW Input Power Capacity: on a 400V 3-phase feed, that headroom covers high-density compute racks without derating concerns, so you're not splitting load across extra PDUs just to stay under capacity.
• Outlet Control (Switched): cycle power to individual outlets or groups remotely to reboot hung servers or power down unused receptacles — no walking the data center floor for a manual power cycle.
• Branch Circuit Protection, 1-pole 20A trip: each branch is individually breakered, so a fault on one server's circuit doesn't take down the whole PDU — isolates the problem to a single outlet group instead of the full rack.
• Branch Current Monitoring: tracks current draw at each breaker branch and fires SNMP alerts before a branch trips from overload — catches capacity creep before it becomes an outage.
• Per-Inlet Power Sensing: measures current, voltage, power, apparent power, crest factor, power factor, and energy at the inlet — the metering data needed for capacity planning and chargeback reporting in colocation or shared environments.
• Auto-Flip Current Display: onboard LEDs cycle through per-phase current readings, making three-phase load balancing a visual check at the rack instead of a laptop-and-SNMP exercise.
• Hot-Swap Network Card with Star Multi-Linking: link up to four power circuits under one IP address, and the Expansion unit keeps the network card powered if the Primary loses input power — you don't lose remote visibility during a partial outage.
• Network Monitoring via HTTP(S), SSH, Telnet, SNMP, (S)FTP, SMTP, Syslog, LDAP(S), RS-232: fits into existing DCIM and monitoring stacks without a proprietary-only management path — use whichever protocol your NOC already runs.
• Temperature/Humidity Monitoring, two 4P4C probe inputs: connect up to two external T/H probes per unit and get SNMP alerts on environmental drift — early warning before a cooling failure damages equipment.
• 10/100/1000 Mbps Ethernet plus RJ-12 Link Port: gigabit management connectivity, with the link port supporting the Star Multi-Linking chain to additional units.
• 0°C to 60°C Operating Range: the STV-4523K is rated for standard data center environments and the warmer aisles found in high-density or edge deployments without a cooling redesign.

Integration & Compatibility

The STV-4523K's SNMP, HTTP(S), and Syslog support means it drops into existing network monitoring infrastructure alongside other rack-mounted gear rather than requiring a dedicated management tool. Pair it with a managed PoE switch for out-of-band management connectivity, and review a power and capacity planning guide before sizing a multi-PDU cabinet — matching branch breaker count and kW headroom to actual server load avoids costly over- or under-provisioning. For broader rack power strategy across a facility, the Server Technology PDU line covers lower-density Smart and Basic models alongside switched units like the STV-4523K, and sits within the wider power distribution units category for side-by-side comparison against other 3-phase options.

Frequently Asked Questions

Q: What's the input power capacity of the STV-4523K?

A: The STV-4523K delivers up to 22.0kW on a 230/400V Wye 32A IEC 60309 3P+N+PE input.

Q: How many outlets does the STV-4523K (often searched as STV 4523K) have?

A: It has 48 IEC 60320/C13 outlets, with switched (remote on/off) control per outlet or outlet group.

Q: Can the STV-4523K remotely reboot individual servers?

A: Yes. As a switched PDU, it lets you cycle power to individual outlets or groups of outlets to reboot servers or power off unused receptacles.

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

A: HTTP(S), SSH, Telnet, SNMP, (S)FTP, SMTP, Syslog, LDAP(S), and RS-232 serial.

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

A: 0°C to 60°C with 8%RH to 90%RH non-condensing humidity, rated for elevations up to 6,500ft/2km.

Q: Does the STV-4523K support environmental monitoring?

A: Yes, it supports two external temperature/humidity probes via 4P4C ports, with SNMP-based alerts and email notifications on threshold breaches.

James Everett

The STV-4523K crosses my desk most often for high-density colocation racks — 48 C13 outlets on a single 22.0kW, 400V 3-phase feed is enough to consolidate what used to take two lower-capacity strips into one zero-U unit.

Technical Highlights:

• 32A IEC 60309 3P+N+PE input: the 230/400V Wye feed and 22.0kW ceiling give you real headroom for a fully populated cabinet without load-balancing gymnastics across multiple PDUs.
• Branch circuit protection, 1-pole 20A trip: each branch breaks independently, so one overloaded server circuit doesn't cascade into a rack-wide outage — critical when you've got mixed-load equipment sharing outlet groups.
• Per-Inlet Power Sensing (PIPS): current, voltage, power, VA, crest factor, power factor, and energy readings at the inlet level give you the metering granularity colocation billing and capacity audits actually need.

Deployment Considerations:

• At 69.0in tall and only 3.25in x 2.25in in cross-section, this mounts vertically in the rack's side channel — confirm your cabinet has zero-U side-mount clearance before ordering, since it's not a horizontal 1U/2U unit.
• The Star Multi-Linking feature ties up to four power circuits to one IP address, which cuts down on management IPs needed per row, but plan your network card placement since the Hot-Swap card only fails over from Primary to Linked unit, not across separate racks.

Specify the STV-4523K for high-density colocation or hyperscale cabinets where you need branch-level circuit protection, remote outlet cycling, and inlet-level metering on a single 3-phase 22.0kW feed — not for a lightly loaded edge closet where a Basic PDU would cover the load with less complexity.