1606-XLSBUFFER24: Ride Through Short Outages Without a Battery
The 1606-XLSBUFFER24 is a capacitor buffer module from the Allen-Bradley Bulletin 1606-XL series. It pairs with a 1606-XLS supply on a 24 V DC bus. Integrated electrolytic capacitors bridge short mains interruptions. No battery, no maintenance. During buffer mode, output holds at 22.5 V. This keeps PLCs and controls alive through dips and contactor chatter.
What the Module Does
- Model: 1606-XLSBUFFER24
- Brand: Allen-Bradley
- Series: Bulletin 1606-XL
- Function: DC buffer, no battery
- Storage element: electrolytic capacitors
- Mounting: DIN rail
- Approvals: UL 60950-1, cUL, CE
Buffer and Power Numbers
- Input bus: 24…28.8 V DC from the supply
- Output: 22.5…27.8 V DC
- Buffer mode voltage: 22.5 V
- Output current: 20 A maximum
- Rated power: 480 W
- Buffer time: 310 ms typical at 20 A
- Charging time: 18 s
- Stored energy: 0.2 kWs
Signal Path
- No built-in communication ports
- No fieldbus protocols
- Status comes from the paired supply’s DC OK relay
Environment and Build
- Operating temperature: -25 to +70 °C
- Storage temperature: -40 to +70 °C
- Relative humidity: 5 to 95 %, non-condensing
- Protection rating: IP20
- Dimensions: 124 × 64 × 102 mm
- Weight: 0.74 kg
- Lifecycle: active on Rockwell page, verified 2026-10
Oiltech Controls’s Insight
Capacitor buffering beats battery backup when the outage is short and the load is fixed. The 1606-XLSBUFFER24 holds 20 A for about 310 ms. That covers most contactor dropouts and generator changeovers. Charge time is just 18 s, so back-to-back dips do not drain the reserve. No battery means no replacement schedule and no acid or cell checks.
Oiltech Controls Review
- Battery-free design removes maintenance cost
- 18 s recharge handles repeated dips
- 22.5 V buffer floor keeps most 24 V devices alive
- DIN rail body fits the same footprint as the supply
Where It Fits
- PLC racks on unstable mains feeds
- Panels with generator or transfer switch events
- Machine cells where battery service is unwanted
- Retrofit of 24 V buses with brief voltage sags
Dispatch and Coverage
- Dispatch window: 24–28 hours
- Carriers: FedEx, UPS, DHL
- Warranty: 12 months
- Technical verification before shipment
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts
- Global shipment support
- Tested industrial surplus and refurbished units
- 12-month warranty on every module
- Technical check before dispatch
- Support for obsolete control systems
FAQ
Q: How long does the buffer last at full load?
A: About 310 ms at 20 A. Lighter loads stretch that time.
Q: Can I use this without a 1606-XLS supply?
A: It needs a 24 V DC bus in the 24…28.8 V range. A matching XLS supply gives the best charge behavior.
Q: Do I have to replace cells like a battery unit?
A: No. Electrolytic capacitors need no routine cell service.
Q: Will buffering drop voltage below my PLC threshold?
A: Buffer mode holds 22.5 V. Check your device’s minimum input before wiring.
Q: How much capacity do I need for a 5 A load?
A: At 5 A the stored energy lasts far longer than 310 ms. Size for your longest expected outage.
Contact Information
Inquiries: info@oiltechcontrols.com
Phone / WhatsApp: +86 158 8020 0923
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