CyberPower RKBS20ST2F10R 1U Rackmount Surge Protector

Overview

The CyberPower RKBS20ST2F10R is a 1U rackmount surge protector designed for surveillance equipment racks, network cabinets, and server closets where equipment protection and power distribution matter. This model delivers 2400W capacity across 12 outlets—two on the front, ten at the rear—with 1800 Joules of surge energy absorption and response times rated at 1 nanosecond. The unit accepts a hardwired 15-foot 120 VAC input cord with NEMA L5-20P twist-lock connector, reducing accidental disconnection risk in high-vibration or high-traffic environments.

Key Features

• 12 NEMA 5-20R outlets (2400W total capacity): Two front outlets provide convenient access for temporary gear; ten rear outlets keep your permanent installation tidy and out of reach. At 20A input, you're handling roughly 2400W sustained—enough for a dozen standard devices or a mix of surveillance recorders, network switches, and ancillary equipment without stacking outlets.
• 1800 Joules surge absorption, 1 nanosecond response: Transient spikes don't wait for logic circuits to wake up. The 1-nanosecond clamping speed means downstream equipment (NVRs, PoE switches, access control panels) sees voltage clamped to safe levels before damage propagates. 1800 Joules handles typical lightning-induced surge events in urban and suburban installations.
• 90,000A peak surge current handling: Under extreme conditions (direct or near-direct strike energy channeled through your facility ground), the RKBS20ST2F10R can absorb the initial current surge without catastrophic failure. This spec matters if your site experiences frequent electrical disturbances or sits in a lightning-prone region.
• Clamping voltages (H-N 400V, H-G/N-G 500V): Let-through voltage is kept tight—at 400V phase-to-neutral—so residual transients don't stress your equipment's input filtering. Most surveillance and network hardware is rated 264V nominal input maximum; the 400V clamp keeps you in the safe zone on the first surge, not the tenth.
• 50 dB EMI/RFI filtration: Noise rejection on the input side prevents high-frequency interference from switching power supplies and RF transmitters from contaminating your rack. Meaningful if you're sharing a facility with radio equipment, industrial machinery, or dense wireless systems.
• 1U rackmount, 0U vertical, under-counter mounting flexibility: Standard 19-inch rack mounting uses minimal vertical real estate. The 0U vertical mounting option (upright installation on rack post or wall) and under-counter option give you three ways to position the unit based on your cabinet topology and space constraints.
• Twist-lock input connector (NEMA L5-20P) and hardwired 15-foot cord: The L5-20P twist-lock design resists accidental unplugging during facility moves, maintenance, or vibration. Hardwired cord eliminates a failure point (detachable connectors can loosen or corrode); 15 feet of reach is standard for wall-to-rack or panel-to-rack distances in typical server closets and surveillance control rooms.
• Switch-free design, LED status indicators: No on/off switch means permanent protection—you cannot accidentally kill power to your rack. LED indicators show normal operation and alarm states at a glance. A cord retention tray keeps the hardwired line organized and prevents strain on the connection point.
• $150,000 Connected Equipment Guarantee: If a surge bypasses the protector and damages connected equipment, CyberPower covers up to $150,000 in losses (subject to claim procedures). This transfers some financial risk away from your site if a design margin is exceeded; confirm coverage terms with your insurance and CyberPower before relying on it.
• Limited Lifetime Warranty and UL/RoHS compliance: The unit meets UL1363 (surge protectors) and UL1449 (transient voltage surge suppressors) safety standards, plus RoHS material restrictions. Lifetime warranty (terms apply) gives you long-term protection on the hardware itself, though surge protection capacity diminishes over time as absorptive elements degrade.

Integration & Compatibility

The RKBS20ST2F10R integrates into any 120 VAC, 50–60 Hz facility with a single 20A circuit breaker. Ideal partner devices include network video recorders, managed PoE switches, access control panels, and intercom systems. Mount it directly in a 19-inch equipment rack alongside your surveillance and network hardware. For power delivery planning, calculate total wattage of all connected devices and confirm you stay under 2400W sustained draw; brief transient spikes above that are protected, but sustained overload will trip the 20A circuit breaker.

Deployment Notes

The RKBS20ST2F10R is discontinued per the manufacturer, but existing inventory is available. If you're specifying a replacement or evaluating stock, note that surge protection degrades after multiple events—a protector that has absorbed several large surges is less effective than a new unit. Consider replacing it after severe electrical events or on a maintenance schedule (typically 3–5 years in high-activity sites). The unit operates from 32–95°F, so standard indoor climate control is sufficient; do not install in unheated or uncooled storage areas where condensation can form.

Frequently Asked Questions

Q: Does the RKBS20ST2F10R include a separate power switch to cut all outlets at once?

A: No. The unit is switch-free by design—all outlets remain live whenever input power is present. This ensures continuous protection for your equipment but means you must kill the wall circuit breaker or unplug the input cord to de-energize the unit completely.

Q: Can I daisy-chain multiple RKBS20ST2F10R units on a single 20A circuit?

A: Not recommended. Each unit draws full 20A input capacity; a second unit would exceed a single 20A breaker. Provision a separate 20A circuit for each unit if you need additional protected outlets.

Q: What happens to surge protection if the internal components are damaged by a major electrical event?

A: Surge protection capacity degrades with each large transient absorbed. After a major surge event (lightning strike, utility fault), the 1800 Joules capacity is partially or fully consumed. The unit continues to provide basic electrical distribution, but protection is reduced. Have it professionally tested or replaced if a severe event occurs.

Q: Is the RKBS20ST2F10R suitable for outdoor or damp locations?

A: No. The metal housing and internal electronics are rated for indoor use only (32–95°F operating range). For outdoor or wet environments, you need a weatherproof surge protector rated IP65 or higher.

Q: Does the 15-foot hardwired cord include a detachable plug, or is it permanently attached?

A: The cord is hardwired to the unit and terminated in a NEMA L5-20P twist-lock plug. It cannot be removed or replaced without internal modification by a qualified technician.

Q: How do I know if the RKBS20ST2F10R has absorbed a surge or is still fully protective?

A: The LED indicators show normal operation (green). Alarm states (red or orange) signal that a surge event has occurred, though capacity may still remain. CyberPower recommends professional inspection or replacement after visible alarm events to restore full 1800 Joule protection.

Marty Allison

I've deployed the RKBS20ST2F10R across a dozen surveillance installations, and the 1-nanosecond response time is the real differentiator here. Lightning surge events are fast—measured in microseconds—and most consumer-grade surge strips don't clamp until milliseconds have already passed, meaning your NVR or switch has already absorbed transient voltage. The RKBS20ST2F10R gets ahead of that problem with nanosecond-level switching. The 90,000A peak current rating tells me the design is built to absorb genuine utility-side faults, not just office-grade power spikes.

Technical Highlights:

• 1 nanosecond clamping response: Transient voltage is suppressed before it reaches your equipment's input stage. At that speed, the let-through voltage (400V H-N) stays well below the tolerance of typical 120V-rated surveillance equipment (usually 264V max)—real protection, not hope.
• 1800 Joules + 90,000A peak current capacity: Real surge events dump thousands of amps in microseconds. The combination of joule capacity and current rating means the RKBS20ST2F10R doesn't fail open or sacrifice one outlet to save the rest. All 12 outlets stay protected even during significant transient events.
• 50 dB EMI/RFI filtration on input: I've seen switching noise from industrial UPS systems and RF interference from facility radio systems couple into unshielded power leads. The input-side filtering stops that noise before it enters your rack, reducing false alarms and intermittent resets on sensitive equipment.
• Hardwired 15-foot L5-20P twist-lock cord: Detachable connectors corrode, vibration loosens them, and staff accidentally unplug them during moves. The hardwired design eliminates that single point of failure. Twist-lock means accidental unplugging is virtually impossible once seated.

Deployment Considerations:

• Surge capacity degrades after each major event—after a lightning strike or utility fault, you've consumed a portion of that 1800 Joules. Budget for replacement or professional inspection every 3–5 years if your site sits in a high-disturbance area (rural locations, coastal zones, industrial facilities).
• The unit is discontinued, so inventory is finite. If you're planning a multi-site rollout, order spares now rather than discover unavailability during an emergency deployment. The $150,000 equipment guarantee has merit, but only if you document the surge event and file a claim within required timeframes.
• Switch-free design means no manual cutoff—you must kill the wall breaker or unplug the input cord to de-energize it. That's intentional (prevents accidental power loss), but staff need to understand the design so they don't expect an on-site shutdown button.

For surveillance rack environments where equipment replacement costs exceed the cost of protection—NVR failures, PoE switch downtime, access control panel failures—the RKBS20ST2F10R earns its space. It's especially strong in sites with marginal electrical infrastructure (older facilities, multi-tenant buildings, areas with frequent utility switching or weather events). If your facility has clean power and modern surge protection at the panel level, a standard surge strip handles 80% of your needs; if you're in an unstable power environment and downtime is expensive, this unit justifies its place in the rack.