Entrasys STK-RPS-150PS Service-Ready Spare Part for Industrial Maintenance

Entrasys STK-RPS-150PS Service-Ready Spare Part for Industrial Maintenance

The Entrasys STK-RPS-150PS is a ruggedized redundant power supply module engineered for continuous operation in demanding industrial network and automation environments. Designed for the Entrasys SecureStack series of stackable managed switches, this spare part is a critical component in any maintenance engineer’s inventory strategy. Whether you are managing a brownfield control network, executing a scheduled annual shutdown, or responding to an unplanned power fault, having a verified, service-ready STK-RPS-150PS on the shelf is the single most effective way to minimize mean time to repair (MTTR) and restore production uptime.

At NINERMAS, every STK-RPS-150PS unit is sourced as an original Entrasys component, individually inspected, and shipped with full documentation. Our 12-month warranty covers all spare parts against manufacturing defects, giving procurement engineers the confidence to commit to long-term stocking programs without lifecycle risk.

Spare Maintenance Table

Maintenance Planning for Continuous Operation

A redundant power supply failure in a SecureStack chassis rarely announces itself — it typically surfaces during a routine control cabinet inspection or, worse, at the moment the primary supply fails and the backup does not engage. Maintenance engineers responsible for Entrasys-based network infrastructure should treat the STK-RPS-150PS as a tier-1 critical spare, stocked alongside other high-availability components in the same control cabinet ecosystem.

When scheduling a replacement or inspection of the STK-RPS-150PS, the following associated components should be evaluated concurrently to avoid repeat call-outs and to ensure the full power distribution chain is healthy:

• Entrasys STK-RPS-150 (primary PSU companion unit) — verify the primary supply is within its rated service life and shows no signs of capacitor aging or thermal stress.
• SecureStack B2G124-24 / B3G124-48 switch chassis — inspect chassis backplane connectors for oxidation or mechanical wear at the PSU bay interface.
• 24 VDC DIN-rail power supplies (e.g., Phoenix Contact QUINT or TRIO series) — if the SecureStack is fed from a DIN-rail PSU in the control cabinet, verify output voltage stability and ripple under load.
• UPS / battery backup modules — confirm that the upstream uninterruptible power supply is correctly sized for the full switch stack load including the redundant PSU draw.
• AC input terminal blocks and fuse holders — inspect IEC 60947-compliant terminal blocks and associated 10 A or 16 A fuse elements feeding the switch bay.
• Entrasys SFP transceivers (e.g., MGBIC-LC01, MGBIC-MT01) — fiber uplink transceivers in the same chassis should be checked for Tx/Rx power levels during any planned maintenance window.
• Ethernet patch cables and RJ-45 field-termination connectors — Cat5e/Cat6 cabling in industrial environments is subject to vibration-induced connector fatigue; replace any cables showing intermittent link errors.
• Signal isolators and surge protection modules — where the SecureStack interfaces with field I/O or SCADA systems, verify that DIN-rail surge arresters on Ethernet ports remain within clamping specification.
• Managed switch configuration backup (TFTP/USB) — before any PSU swap, ensure the running configuration is backed up to prevent loss of VLAN, QoS, and port security settings.
• Cooling fans and airflow baffles — the STK-RPS-150PS generates heat under full load; confirm that chassis fan modules are operational and cabinet airflow is unobstructed.

Procurement engineers building annual MRO (Maintenance, Repair and Operations) budgets should consider stocking a minimum of one STK-RPS-150PS per two active SecureStack chassis. For sites with 24/7 production schedules or remote locations where same-day sourcing is impractical, a two-unit buffer per site is recommended. NINERMAS supports long-term supply agreements with fixed pricing and priority allocation for high-volume customers.

Site Replacement Workflow

Replacing the STK-RPS-150PS in the field is a straightforward hot-swap procedure, but proper sequencing is essential to avoid introducing a secondary fault during the maintenance window:

1. Verify redundancy status — before removing the failed unit, confirm via the Entrasys Network Management System (NMS) or CLI (show system) that the primary PSU is active and carrying full load. Never remove a PSU if both units show a fault condition simultaneously.
2. ESD precautions — attach a grounded wrist strap before handling the module. The STK-RPS-150PS contains sensitive switching circuitry susceptible to electrostatic discharge.
3. Slide-out extraction — release the retention latch, slide the module out of the chassis bay, and place it in an anti-static bag for return or disposal.
4. Inspect the bay — check the backplane connector pins for bent contacts or debris before inserting the replacement unit.
5. Insert and latch — slide the new STK-RPS-150PS firmly into the bay until the latch engages. The chassis will automatically detect the new PSU and begin load sharing within seconds.
6. Verify via CLI or NMS — confirm both PSU slots report OK status. Log the replacement date, serial number of the removed unit, and technician ID in the site maintenance register.
7. Update spare parts inventory — immediately initiate a replenishment order to restore your buffer stock. NINERMAS can ship replacement units within 2 business days from confirmed order.

This workflow is compatible with legacy Entrasys SecureStack deployments running firmware versions 6.x through 7.x and does not require any software reconfiguration after a PSU replacement. For sites migrating from older Enterasys (pre-rebrand) chassis, the STK-RPS-150PS is backward-compatible with equivalent legacy power bay form factors — confirm chassis model compatibility with NINERMAS technical support before ordering if you are unsure.

Spare Parts Support FAQ

Q1: What is the warranty coverage for the STK-RPS-150PS supplied by NINERMAS?
All STK-RPS-150PS units shipped by NINERMAS carry a 12-month warranty from the date of shipment. This covers manufacturing defects, premature component failure, and DOA (dead-on-arrival) units. Warranty claims are processed within 5 business days, and replacement units are dispatched with priority shipping. The warranty does not cover damage caused by incorrect installation, overvoltage events, or physical mishandling on site.

Q2: How do I confirm compatibility before ordering?
The STK-RPS-150PS is designed for the Entrasys SecureStack B2, B3, C2, and C3 series chassis. To confirm compatibility, identify your chassis model number from the front panel label or via show version in the CLI, then cross-reference with the Entrasys SecureStack hardware installation guide. If you are working with a mixed-generation stack or an Enterasys-branded (legacy) chassis, contact NINERMAS at sale@ninermas.com with your chassis model and we will confirm fit before you commit to an order.

Q3: Does NINERMAS support long-term supply agreements for critical spare parts?
Yes. NINERMAS offers long-term supply programs for maintenance engineers and procurement teams managing multi-site or multi-year MRO budgets. These programs include reserved stock allocation, fixed unit pricing for 12–36 month periods, and priority fulfillment for emergency orders. This is particularly valuable for the STK-RPS-150PS, which is an end-of-life (EOL) Entrasys component with limited availability on the open market. Contact our sales team to discuss volume commitments and lead-time guarantees.

Q4: What pre-shipment testing is performed on each unit?
Every STK-RPS-150PS unit undergoes a functional power-on test and output voltage verification before dispatch. Units are inspected for physical integrity, connector condition, and correct labeling. A test report is available on request for customers with incoming inspection requirements. Units are packed in anti-static packaging with foam protection to prevent transit damage. For customers requiring third-party inspection or specific documentation (e.g., material certificates, RoHS declarations), please advise at the time of order.