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Description
KIRSCH Refrigerator LABO 520 PRO-ACTIVEProduct overview With PRO ACTIVE control (permanent monitoring) Two PT 1000 sensors for precise temperature control Recirculating air cooling ensures even temperature Automatic rapid defrost and melt water evaporation Optionally as version LABO 520 or 720 KIRSCH Refrigerator The energy saving KIRSCH Refrigerator with four smooth running castors complies with DIN 13277 and is equipped with an innovative PRO ACTIVE control system that enables permanent
Product overview- With PRO-ACTIVE control (permanent monitoring)
- Two PT-1000 sensors for precise temperature control
- Recirculating air cooling ensures even temperature
- Automatic rapid defrost and melt water evaporation
- Optionally as version LABO 520 or 720
KIRSCH Refrigerator
The energy-saving KIRSCH Refrigerator with four smooth-running castors complies with DIN 13277 and is equipped with an innovative PRO-ACTIVE control system that enables permanent and proactive monitoring of performance data. Two standard PT-1000 sensors ensure precise temperature regulation, while the efficient recirculating air cooling stabilises temperature control and ensures low temperature differences between the individual storage locations. The 70 mm thick insulation minimises the energy consumption of the laboratory refrigerator.
In the event of a power failure or other malfunctions, a visual and acoustic alarm indicates the malfunctions in the cooling system. Thanks to the battery, the monitoring unit remains in operation for another 30 hours despite the power interruption. The data of the integrated min. and max. temperature memory can be read out via USB interface or via a network, depending on the version. This function saves the specialist staff the time-consuming manual documentation of the temperature data in everyday work.
The Kirsch Laboratory Refrigerator is available in various sizes and with different equipment.
Product Details
- KIRSCH Refrigerator
- With PRO-ACTIVE control (permanent monitoring)
- Two PT-1000 sensors for precise temperature regulation
- Recirculating air cooling ensures even temperature
- Low temperature gradient between the storage locations
- Freeze protection against minus temperatures
- Door opening alarm after 60 seconds
- Visual and acoustic alarm
- Monitoring unit in operation for approx. 30 h due to rechargeable battery
- Automatic rapid defrost and melt water evaporation
- Lockable and self-closing door
- Interchangeable door hinge (also retrofittable)
- Energy-saving insulation (70 mm thick)
- Including five plastic-coated grates
- Housing made of galvanised sheet steel (rust-protected)
- White powder-coated, particularly scratch-resistant
- Adjustable feet in the front area
- Easy levelling of uneven floors
- Interior in smooth aluminium with coating
- Adjusting rails: 15 mm grid
- Plug cable length: 2.8 m
- Can be moved around easily thanks to four smooth-running castors
- Forced-air cooling machine with quiet fan
Differences between PRO-ACTIVE and ULTIMATE
| PRO-ACTIVE | ULTIMATE | |
| Display | Membrane keypad with digital temperature display and min./max. temperature memory. | Capacitive touch display in elegant glass design. Graphic display of the temperature curve and the min./max. temperature. |
| Temperature regulation | Protected by key switch. | Protected by RFID/password. |
| Alarm forwarding | Via potential-free contact (e.g. on mobile phone with GSM module or connection to central control technology). | |
| Data documentation | Reading via USB interface using USB stick and KIRSCH Datanet software. | Digital - can be read out via network (PC-KIT-NET) and KIRSCH Datanet software. |
| Access control | No. | Yes - with protocol function. |
| Quiet Fan | No. | Yes. |
Technical Specifications
| BL 520 | BL 720 | |
| Capacity | 500 litres | 700 litres |
| Temperature Setting | ca. 0 °C bis +15 °C | |
| Voltage | 220-240 V, 50 Hz | |
| Power Input | 250 watts | |
| Standard consumption | 1.40 kWh/24 h |
1.46 kWh/24 h |
| Permissible Ambient Temperature | +10 °C bis +38 °C | |
| Heat Emission (max.) | 553 watts | |
| External Dimensions (incl. wall distance & door handle) | 77 x 76 x 195.5 cm (W x D x H) | |
| Inner Dimensions | 62 x 57 x 140 cm (W x D x H) | |
| Outer Dimensions with Door Open at 90° | 71 x 144 cm (W x D) | 77 x 165 cm (W x D) |
| Grate Size | 59 x 45 cm (W x D) | 59 x 65 cm (W x D) |
| Max. Load Grate | 40 kg | |
| Weight | 125 kg (net); 148 kg (gross) | 141 kg (net); 167 kg (gross) |
*Values may vary minimally depending on the variant (see product data sheet).
Shipping Notes
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Exchange/Return Notes
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- Final sale items are not eligible for returns or exchanges.
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4.5 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 4
Very nearly the perfect frother for all your basic frothing & mixing needs
Color: Black
There are a lot of middle-of-the-road frothers out there. I've been through a few of them in my recent search for something that could mix and froth well, without taking up any more outlets in my basement kitchen. Of the three Maestri frothers I've tried so far, this one wins the race by a nose.
Most recently, these Maestri frothers come in basically three versions: A single-speed @ 8000 RPM, a two-speed @8000/5500 RPM, and this stepless variable-speed version. Aside from that, the only real difference in recent version pack-outs is which attachments they come with.
Look over the reviews of the single-speed version and you'll find that while it can and does froth well, it starts at a single, high speed and gets there fast. This makes it pretty easy to spin liquid right out of most common cups and mugs.
There is a two-speed version, but it's harder to find, only comes in one color (Grape Purple), and while it's much better than the Maestri single-speed, it still has a couple of quirks that make this variable-speed version win out.
This mixes and froths whole milk, half-and-half, or heavy whipping cream, or just about anything else very well. Like all frothers, it takes a little time to learn its nuances and nail down the technique, this will definitely get you there.
The best feature of this is easily the speed control. Turn the knob to turn it on at a low speed that's great to get things started, then turn the knob to crank up the speed just enough to do what you need, whether that's mixing or frothing. The low starting speed makes it easy to keep things under control without undue spilling, and the max speed is more than enough to make quick work of getting your froth on.
There are really only two complaints I have with this stepless, variable speed version:
- I'd really like to have a Press On / Release Off button in addition to the Speed Control knob. More than one time have I gone to turn this off, only to spin the knob the wrong way and crank the speed up to ludicrous, sloshing liquid on the counter. Being able to turn it Off just by letting go of the button would be quick and easy. This configuration would allow using a preferred speed right from the start, while still allowing speed to be adjusted on-the-fly when needed.
- Give it a bigger battery. It would cost mere pennies to give this a 2000mAH+ instead of a 1200mAH battery, and I can't think of any reasonable downside to that.
- Give the motor a little more torque. It's fairly easy for the current motor, at any speed, to get bogged down in a thick protein powder mix, or when pressing the frother or other attachment a bit too hard into the bottom or side of the frothing container. A bit more "oomph" would prevent that.
I really like the overall design and features of thes Maestri frothers better than many other, cheaper versions. This variable-speed version is pretty great as it is and probably the one I would recommend over the single- or two-speed, for most people. But I often find myself using two hands -- one to hold it steady, and the other to turn it on and tweak the knob to the desired speed(s) -- for a device that should arguably need only one hand to use. Just a couple of minor tweaks as noted above would make this the overall best frother of its type that I've used.
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Reviewed in the United States on May 23, 2025
★★★★★ 5
Hands down, the BEST handheld frother I've ever used!
Color: Black
Hands down, the BEST handheld frother I've ever used! I got the black one, but any color will have the same results.
Over the past 12 years or so, I've used so many different handheld frothers and they've ALL fallen short of expectations for quality, longevity, power, features, and usability.
I've used everything from cheap, $15 models to $50+ models and everything in-between. Some with fancy attachments for various types of mixing, frothing, beating, whipping, etc. Some with rechargeable batteries, some without. Some AC powered, some with fixed whisks, some with detachable/replaceable whisks, some with stands, etc. NONE have been spectacular. Most broke within 6 months and got tossed. ALL were major disappointments in the end, including the "revered" Zulay models of which I tried several.
I finally found this Maestri House branded, variable speed frother with detachable / replaceable whisks and got one to try. I was literally on Cloud Nine the first time I turned it on. Like, WOW! Not only was it FAST on the highest speed, but it was powerful enough to churn right through milk, eggs, cream, etc, without bogging down like many others.
This thing makes milk froth like a milkshake and Matcha Lattes like nothing else I've ever experienced. I used to have to sift my Matcha, then whisk it in hot water, then froth milk and then blend them together to make the perfect latte. and if the milk was cold (my preference), pre-whisking in hot water was a must to avoid lumps. However, with THIS frother? I literally pour my milk into a tall tumbler, drop in un-sifted Matcha powder, and spin up the Maestri House frother at first on a medium low speed to get it mixed, then jump straight to the highest speed to really whip that milk and match up. After about 30-45 seconds, I've got the thickest, richest, smoothest, most aerated latte around. And NO LUMPS at all!!! What a time and dish saver!
And cleaning? I just run it under hot running water to get the shaft cleaned and then spin it up in a dish with hot running water for a few moments, then spin it on high for a few seconds in the air to dry it off instantly.
Now, I'll be honest here, too. The specs say it can go months on a charge, using it for a couple minutes a couple times daily. Well, I guess it could do that and still spin. But I use it FULL SPEED, churning hard for at least a minute a couple times per day. After about 2 weeks, I can start to notice a speed reduction so I just plug it back in on the charger. All things considered, this is still better than all the other handheld frothers I've used over the years.
After using the heck out of this thing for the past 7 months, I've even decided to start selling these in our Japanese gift shop. The manufacturer is has been very responsive both in customer support (I called them about an issue I thought I was having, and they called me back with a couple hours even though I didn't leave voicemail when they didn't answer right away) and in reseller support. I have to give these guys an A+ for responsiveness and quick resolution when problems might arise.
HIGHLY recommended!!
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Reviewed in the United States on October 17, 2025
★★★★★ 5
Great Addition!
Color: Black
Why did you pick this product vs others?:
I just started a powdered drink routine recently and was having a difficult time mixing it with water. I would consistently end up with small nuggets of mix making it unenjoyable to drink. I knew I needed a mixer and was glad I found this device when I did. It works perfectly! I like the fact that it comes with its own stand and included two mixing heads. It is solid, well-designed, and you can feel the quality when you pick it up. The variable speed of the mixer is perfect for ensuring that everything is blended well. I haven’t used it to “froth” anything yet, at least not on purpose, but I accidentally found out that it can do that well. This is a great addition to our kitchen and is very easy to wash after use. So far…no issues. Highly recommend for those of you looking for the right tool to make sure those protein mixes aren’t full of unmixed nuggets.
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Reviewed in the United States on June 21, 2025
★★★★★ 4
Low foam
Color: Black
Love this frother. It is great quality and the turn speed is amazing. My only issue is this. It comes w 2 wands and they are both singles. The single is great for stirring things up. It does not make a lot of froth and for some things it’s perfect but sometimes I like a lot of froth and I wish it either came w a single and a double or you could purchase a double separately to intermix. I don’t want to buy a whole other unit just for the double. I wrote to them bc the double frother they sell doesn’t look as good as this one but sometimes a girl needs a lot of foam and sometimes th stirring is perfect.
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Reviewed in the United States on February 20, 2026
★★★★★ 5
Perfect for Lattes
Size: 20 Ounces
Good for steaming 8-10 oz of milk. The nifty tool is good for scooping out your puck.
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Reviewed in the United States on February 19, 2026
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