What is the primary function of an Off-line (standby) UPS?

An Off-line UPS primarily provides surge protection and switches to battery power when it detects a power outage or significant voltage drop. It is a cost-effective solution for non-critical applications.

How long can this type of UPS typically provide backup power?

Runtime varies significantly with the connected load. For this class of equipment, expect a few minutes at full load, extending to 10-20 minutes at half load, sufficient for a graceful shutdown.

Are the batteries user-replaceable?

Many UPS units in this category, including APC Back-UPS models, feature user-replaceable batteries, often hot-swappable, simplifying maintenance.

What kind of equipment is best suited for a stepped approximation to a sine wave output?

This output is generally suitable for most computers, monitors, and equipment with switching power supplies. It may not be ideal for sensitive electronics, motors, or equipment with active power factor correction.

What certifications are typically found on these UPS units?

Common certifications for UPS units sold in the UK and Europe include CE marking, indicating conformity with health, safety, and environmental protection standards.

used Equipment

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APC - Back-Ups CS 500 UPS

Name: Back-Ups CS 500 UPS
Brand: APC
SKU: 40983.SR11B
Price: 60 GBP
Availability: InStock

Price: £ 60

This listing is for the APC Back-Ups CS 500 UPS

The unit is in full working condition and is ready for immediate use

Key Specs & Performance

Capacity: 500 VA / 300 W – suitable for basic PC setups, modems, routers, or low-power peripherals

Runtime:

~2.4 minutes at full 300 W load

~13.8 minutes at half load (150 W)

Topology: Off-line (standby) UPS with ~6 ms transfer time

Waveform Output: Stepped approximation to a sine wave

Connections & Interfaces

Input Connection Type: IEC 60320 C14

Output Connection Types:

3 × IEC 60320 C13 (Battery Backup + Surge Protection)

1 × IEC 60320 C13 (Surge Protection Only)

2 × IEC jumper surge-protected outlets

Number of Cables: 2 included

Data-Line Protection: RJ-11 phone/fax/DSL line

Communication Ports: USB + optional RS-232

Management Software: Supports APC PowerChute Personal Edition

Battery & Power

Battery Type: Sealed lead-acid maintenance-free (VRLA)

Battery Cartridge: APC RBC2

Battery Recharge Time: ~8 hours

User-replaceable: Yes, hot-swappable

Battery Life Expectancy: 3–6 years

Cold-Start Capable: Yes

Self-Test: Automatic periodic testing

Surge & Safety Features

Surge Energy Rating: 300–310 J

Noise Filtering: Full-time EMI/RFI filtering

Audible Alarms: Yes – for battery use, overload, low battery

LED Indicators: Status display panel

Certifications: CE, VDE, GOST, C-Tick

Resettable Circuit Breaker: Included

Physical Characteristics

Height: 16.5 cm

Width: 9.1 cm

Depth: 28.4 cm

Net Weight: 6.03 kg

Color: Beige/Light grey (typical for CS series)

Noise Level: Approx. 40–45 dBA

Cambridgeshire, United Kingdom

5,791 km away

Model Number

CS 500

Stock Number

40983.SR11B

Machinery Masters View

Typical context for this category of equipment. Always confirm specifics with the seller.

Applications & Use Cases

Providing backup power for critical laboratory instruments during mains power fluctuations or outages.
Protecting sensitive biotech equipment from power surges and spikes.
Ensuring continuous operation of data acquisition systems and control units in pharmaceutical research.
Maintaining power to essential facility systems like security cameras or access control during brief power interruptions.
Supporting low-power IT infrastructure within labs, such as network switches or small servers.

Typical Specifications

Typical capacity: For this class of equipment, capacities commonly range from 300 VA to 750 VA, suitable for individual workstations or small network devices.
Power supply: Units of this type typically operate on standard single-phase mains power, commonly 230V AC in the UK.
Battery type: Sealed lead-acid (VRLA) maintenance-free batteries are standard for this category of UPS.
Output waveform: Off-line or standby UPS units commonly provide a stepped approximation to a sine wave output.
Transfer time: Transfer times for standby UPS systems are typically in the range of 4-8 milliseconds.
Connectivity: Commonly features IEC C13 output sockets for battery backup and surge protection, along with USB or serial communication ports.
Footprint: Desktop or tower form factors are typical, designed for placement alongside the protected equipment.

Frequently Asked Questions

An Off-line UPS primarily provides surge protection and switches to battery power when it detects a power outage or significant voltage drop. It is a cost-effective solution for non-critical applications.

Machinery Masters Intelligence. General guidance for this category of equipment only, not a substitute for the seller's exact specifications. Always confirm details with the seller.