The Hugo Muller SC98.20 is a digital year timer for panels that need switching schedules running further ahead than a single week. Alongside the usual daily and weekly programs, it holds up to 300 permanent switching commands by date, so public holidays, seasonal shutdowns and annual maintenance windows can all be entered once and left alone.

Two potential free change over channels let one unit control two separate circuits on independent schedules. Each channel switches up to 16A on resistive load, enough to drive lighting circuits, heaters and contactor coils directly without an interposing relay. Alongside the time programs it also offers pulse, cycle, timer and external input functions, plus an elapsed time and pulse counter.

Practical details matter on a timer that stays in a panel for years. The 10 year battery reserve holds the clock and program through long outages, automatic daylight saving removes the twice yearly site visit, and PIN code security stops unauthorised schedule changes. The illuminated LCD stays readable in dark plant rooms, and the data key function lets one programmed schedule be copied to further units instead of being keyed in by hand. The unit mounts on 35mm din rail and is VDE certified, made in Germany.

Features

2 Channels
Daily, Weekly and Yearly Program
300 memory locations
10 years battery-reserve
Minimum interval 1 min
Switching capacity 16 A per channel
Up to 300 permanent switching by date
Manual permanent mode
Manual override
Fully Automatic daylight saving time
Elapsed time and pulse counter
Pulse function
Cycle function
Timer function
External Input function
Channel button function
Security by PIN-Code
Illuminated Display
Data-key function
Make / Brand: Hugo Muller
Country of Origin: Germany

Technical Data

Supply voltage	24VDC, 50 Hz, other voltages on request
Power consumption (real power)	1,2-3,2 W (depending on the switching status)
Channels (potential-free)	Change-over, contact gap < 3 mm (µ)
Contact material	AgSnO2
Switching capacity per channel resistive load: inductive load:	16 A / 250 V~ at cosφ=1, 10 A at cosφ=0,6
Min. switching power	1.000 mW (10 V / 10 mA)
Max. starting current	50 A
Filament Lamp, Halogen Lamp	2.000 W
Fluorescent Lamp uncompensated	1.000 VA
Fluorescent Lamp series compensated	1.000 VA
Fluorescent Lamp parallel compensated	550 VA
LED (230 V~) / CFL	200 W
Switching functions	ON, OFF, pulse, cycle, yearly program
Pulse length Pulse function (switching time)	00:01 up to 59:59 mm:ss
Pulse length Timer (man. switching)	0:00:01 up to 9:59:59 h:mm:ss
Pulse/Pause length Cycle	0:00:01 up to 9:59:59 h:mm:ss
Memory locations	300
Minimum interval	1 Min.
Time base	Quartz, DCF (FU 20.00 pro), GPS (FU 3x.00 pro)
Quartz accuracy (at 20°C)	≤±0,5 Sec./day (Quartz accuracy optimized for typical ambient conditions)
Power back-up (at 20°C)	approx. 10 years (depends on the Lithium-battery life)
Program security	unlimited (E2-Prom)
Display	high resolution LCD (visible area 12,8 cm2)
Permitted ambient temperature	–30°…+55°C
Housing	self-extinguishing thermoplastic
Dimensions	45 x 71,5 x 58 mm
Mounting	35 mm DIN-rail
Type of connection	Screw terminals (Pull-up type)
Type of protection	IP 20 to DIN EN 60529
Class of protection	II when installed according to regulations
Mode of operation (DIN EN 60730-1) (DIN EN 60730-2-7)	1 BSTU
Degree of contamination (DIN EN 60730-1)	2
Rated surge voltage (DIN EN 60730-1)	4 kV
Accessories (not included in delivery)	Data-key DK pro, Programming package PP 50 pro, Programming package PP 60 pro
Certification mark	VDE
Model	SC98.20
SKU	SC9820

Download Product Manual

Common Applications

Street and facade lighting on seasonal schedules, school and office buildings with term and holiday calendars, mosque and community building timing, irrigation and pump cycles, HVAC and ventilation programs, car park and signage lighting, industrial process timing with the pulse and cycle functions, and any installation where the schedule changes on specific calendar dates rather than only by day of week.

Related Timers

If the schedule should follow sunrise and sunset instead of fixed clock times, an astronomical model suits better. The 172413 astronomical timer gives daily, weekly and astronomical programs with 60 memory locations on 230V, and the 170413 astronomical timer is the simpler single channel version with NFC and Android app programming. Where the unit goes into a wall rather than a panel, the 173113 flush mount astronomical timer fits a standard back box.

Browse the full digital yearly timer range, or the complete digital and analog timers category for weekly timers, cyclic timers and analogue time switches.

Why Buy From Qahraba

Qahraba supplies electrical contractors, panel builders and procurement engineers across the UAE and worldwide. Local UAE orders ship within 1 to 2 working days, or collect from our Dubai store. Call or WhatsApp +971 52 913 9543 for technical help, programming support or bulk pricing.

FAQ,s

What is a digital year timer?

It is a time switch that stores a full calendar of switching commands rather than just a weekly cycle. Dates such as public holidays, school terms and seasonal shutdowns are programmed once and repeat automatically.

What is the difference between a yearly and a weekly timer?

A weekly timer repeats the same seven day pattern indefinitely. A yearly timer adds date based commands on top of that, so it can override the weekly pattern on specific calendar days.

How many circuits can the SC98.20 control?

Two. Each channel is a potential free change over contact switching up to 16A resistive, so the two circuits can run on completely separate schedules.

What happens to the program during a power cut?

The clock and settings are held by a lithium battery with around 10 years of reserve, and the program itself is stored in E2-Prom with unlimited retention.

Does it handle daylight saving automatically?

Yes, the changeover is fully automatic, so nobody needs to visit the panel twice a year to adjust it.

Can the program be copied to other units?

Yes, using the optional Data-key DK pro accessory, which is not included in delivery.

Digital Year Timer 24VDC 2 Channel Din Rail SC98.20 Hugo Muller