The Cisco Catalyst IR1101 specifies a maximum input current of 1.24A at 9.6V DC falling to 0.26A at 60V DC across an integrated 9.6-60V DC input, with a chassis weight of 2.25 lbs (1.02 kg) [S1]. Engineers need that current-vs-voltage curve, not just a single watt figure, to size DC breakers, fuse holders, and redundant PSU rails in cabinet builds.
Footprint varies by an order of magnitude between small-cell industrial routers and metro-class chassis. The Ubiquiti UMR-Industrial (UMR-Industrial) measures 114.5 x 93.6 x 32 mm without antennas and weighs 360 g, while the Nokia FRRO501a industrial 5G fieldrouter ships at 290 x 189 x 56 mm and roughly 2 kg [S2][S7]. A control cabinet that swallows a UMR-Industrial will not accept a Juniper ACX7024 without rack rework.
Wide-Range DC Input and the Current-Load Curve
Wide-input DC design is the single most important power parameter on a 4G/5G industrial router datasheet, because vehicle, solar, and 24V factory rails all swing under load [S3]. A wide 9-36V or 12-48V input tolerates cranking dips and solar-bus transients; a narrow 12V±5% input only fits stable cabinet power. Typical industrial ranges cluster at 9-36V (UR71 family, many Movingcomm designs) and 9-60V (IR1101) [S1][S3][S4].
The IR1101 is a textbook case: at 9.6V DC it pulls 1.24A (roughly 11.9W), and at 60V DC it pulls only 0.26A (roughly 15.6W, reflecting higher conversion loss at low line) [S1]. The UniFi UMR-Industrial collapses that into a single ceiling of 12.5W maximum, accepted via PoE+ (48-54V DC), USB-C 5V DC, or a 4-pin ATX 9-30V DC input [S2]. When the datasheet quotes watts only, convert back to amps at your worst-case DC bus (e.g. 12.5W / 9V = 1.39A) to verify fuse sizing.
Footprint, Weight, and Cabinet Fit
Industrial router dimensions fall into three practical tiers. The compact tier includes the UMR-Industrial at 114.5 x 93.6 x 32 mm bare (213 x 93.6 x 32 mm with antennas), 360 g, IP66 polycarbonate-and-aluminum housing, and 25 g DIN-rail/wall mounts [S2]. The mid tier covers DIN-rail units like the Ursalink UR71 and the Cisco IR1101 base platform; the IR1101 ships at roughly 1.02 kg and supports expansion modules for storage and additional WAN [S1][S4]. The chassis tier is reserved for rack-mount metro routers; the Juniper ACX7024 and ACX7024X list typical power draw of 97W at 25°C and maximum 150W (without optics), which is a different procurement category from a DIN-rail cellular edge device [S5].
Weight follows function. The UMR-Industrial is light enough to mount on 1-2 inch (25-50 mm) poles with the included polycarbonate bracket, and is rated for 38.8 N wind load at 200 km/h (8.7 lbf at 125 mph) [S2]. The Nokia FRRO501a is heavier at approximately 2 kg and sized for fixed-installation cabinets, with an operating window of -40 to +70°C and a 56 mm depth that fits standard 19-inch rack subracks when paired with a shelf [S7]. For cabinet fit, the rule of thumb is: verify the longest dimension plus connector bend radius (typically 30-50 mm for RJ45 and SMA) does not exceed the planned DIN segment or shelf depth.
Operating Temperature, Humidity, and Power Heat Budget
Industrial router current draw feeds directly into a thermal budget, because most DIN-rail units are fanless and rely on the enclosure for cooling [S3]. The Cisco IR1101 specifies -40 to +60°C standard, -40 to +75°C in a forced-air enclosure with 200 LFM airflow, and a 16-hour type test at 85°C [S1]. The UniFi UMR-Industrial and Nokia FRRO501a both list -40 to +70°C operating ranges, with the UMR-Industrial tolerating 5-95% noncondensing humidity [S2][S7].
At 12.5W, the UMR-Industrial sits in the 6-12W "high-performance" band identified in industrial router selection guidance, which requires verified heat dissipation in a sealed cabinet [S2][S3]. Mainstream 4G routers fall in the 3-6W band and low-power telemetry units below 3W; annual electricity cost scales linearly with this number (Power x 24 x 365 / 1000 x kWh price) [S3]. Specifying a fanless 12W router in a non-ventilated panel without derating is the most common thermal failure mode we see in retrofit deployments.
Interfaces, Mounting, and Power-Input Methods
The UMR-Industrial offers three power-input methods on a single SKU: PoE+ at 48-54V DC, USB-C at 5V DC (3A adapter included), and a 4-pin ATX terminal at 9-30V DC, plus a PoE output up to 10W to a downstream device [S2]. The Cisco IR1101 takes a single 9.6-60V DC input and adds expansion modules for LTE, 5G, 5G RedCap, SFP, and storage, enabling dual-active cellular for WAN redundancy [S1]. The Ursalink UR71 uses a 1 x RJ-45 Gigabit Ethernet port (10/100/1000 Base-T, IEEE 802.3), 1 x RS232 or RS485 serial on DB9 female or terminal block (300 bps to 230400 bps), and 2 x SMA cellular connectors plus 2 x SIM slots for carrier failover [S4].
Mounting options are equally divergent: the UMR-Industrial ships with DIN-rail, wall, and pole mounts in the box; the IR1101 is designed around a modular base platform with field-upgradeable WAN modules; the UR71 mounts on DIN rail or shelf and weighs roughly 1 kg-class [S1][S2][S4]. When comparing like for like, treat the mechanical drawing (with antenna and outdoor-cover extensions) as the binding footprint, not the bare-chassis dimension.
Where These Specs Come From and What to Verify on Site
The IR1101 figures (1.24A at 9.6V, 0.26A at 60V, 1.02 kg, 9.6-60V DC) come directly from the Cisco Catalyst IR1101 Rugged Series Router Data Sheet, which is the controlling OEM document for that SKU [S1]. The UMR-Industrial dimensions, weight (360 g bare, 395 g with outdoor cover), 12.5W maximum draw, and 9-30V DC ATX input are published on the Ubiquiti tech-specs page, the same source that lists its 802.11n data rates (6.5-300 Mbps MCS0-MCS7, HT20/40) and 22 dBm max TX power [S2]. The UR71's 2.0W typical power consumption, 800 MHz 64-bit ARM Cortex-A53 platform, and 64 MB Flash / 256 MB DDR3 RAM figures originate in the Ursalink/Milesight datasheet PDF [S4].
On site, verify three things before energizing: that the actual DC rail stays inside the datasheet voltage window under motor-start transients, that the calculated steady-state current (Power/Worst-case voltage x 1.25 safety factor) does not exceed the breaker or fuse rating, and that the cabinet's thermal rise at the router's worst-case ambient stays within the operating-temperature column. The dual-power-input pattern in related redundant-supply designs applies to the UMR-Industrial's PoE+ and ATX feeds; the IR1101 supports cellular redundancy via two modules rather than two power feeds. Specifiers working across plant-floor and outdoor pole-mount scenarios should treat these three numbers (voltage window, maximum current at minimum voltage, thermal derating curve) as the binding datasheet inputs, since a single mismatch in any of them will surface as a field failure within the first quarter of operation.
Spec-level background on the components involved: industrial router, draw wire sensor, and eddy current tester.