APC by Schneider Electric SYH6K6RMI vs APC by Schneider Electric SYH6K6RMT-TF3: Specification Comparison
Both the SYH6K6RMI and SYH6K6RMT-TF3 are APC Symmetra RM rack-mountable UPS systems rated at 6 kVA / 4,200 W with N+1 redundancy architecture. This comparison examines the two models across output connectivity and wiring requirements, battery and runtime characteristics, and environmental certifications and management interfaces — the three axes most critical to data center and critical-infrastructure buyers selecting between these otherwise closely matched power protection platforms.
In This Guide
Which model fits your outlet and wiring infrastructure?
The SYH6K6RMI is designed for hard-wire 3-wire input, meaning it requires a direct electrical panel connection with no plug — a common requirement in international rack deployments. Its output bank delivers eight IEC 320 C13 receptacles plus two IEC 320 C19 receptacles, making it well suited for international-standard PDUs, European server equipment, and mixed C13/C19 load profiles.
The SYH6K6RMT-TF3 ships with a 1.83 m input cable and terminates in a plug-in configuration. Its output side provides four NEMA L5-20R twist-lock receptacles and two NEMA L6-20R twist-lock receptacles — a North American 120 V / 208 V split layout that targets US-market rack environments. Buyers must match their existing PDU and branch-circuit receptacle types to the correct model; these two output configurations are not interchangeable without rewiring.
How do the battery specifications and runtime characteristics compare?
The SYH6K6RMI specifies backup times derived from its sealed lead-acid battery with suspended electrolyte: 12.7 minutes at full load (6 kVA / 4,200 W) and 30.3 minutes at half load (3 kVA / 2,100 W). Its replacement cartridge is identified as the APC SYBT2. Hot-swap capability and recharge time are not stated in the provided specification data for this model.
The SYH6K6RMT-TF3 specifies a Sealed Lead Acid (VRLA) battery technology with a 3-hour recharge time and confirms hot-swap battery support — meaning batteries can be replaced under load without a maintenance window. Runtime figures at full or half load are absent from the provided specification data for this model. Buyers who require confirmed hot-swap capability will find that spec only in the SYH6K6RMT-TF3 data; buyers who need quantified runtime guarantees will find that data only in the SYH6K6RMI data.
What certifications and remote management options does each model carry?
The SYH6K6RMI specifies an interface suite of DB-9 RS-232 plus RJ-45 10Base-T Ethernet described explicitly as supporting web, SNMP, and Telnet management. No third-party safety certifications are listed in the provided specification data. Its Harmonized System code (85078000) is documented, which is relevant for import/customs compliance.
The SYH6K6RMT-TF3 carries documented certifications of CSA, FCC Part 15 Class A, and UL 1778 — the last being the recognized North American UPS safety standard. Its interface is listed as DB-9 RS-232 and RJ-45, but the specification does not explicitly enumerate web/SNMP/Telnet capability as the SYH6K6RMI does. It also specifies an audible alarm and a documented weight of 176.8 kg, which has direct bearing on floor-load planning. The SYH6K6RMI does not list weight in the provided data.
Which should you choose: the SYH6K6RMI or the SYH6K6RMT-TF3?
Our take: The SYH6K6RMI is the stronger choice when deploying in international or European rack environments that use IEC outlet standards, require hard-wire panel input, and need documented runtime figures — it provides 12.7 min at full load and 30.3 min at half load, and its RJ-45 interface is explicitly confirmed for web/SNMP/Telnet management. The SYH6K6RMT-TF3 is the correct selection for North American facilities running NEMA L5-20R and L6-20R branch circuits; it adds certified hot-swap battery replacement (avoiding downtime during maintenance) and carries UL 1778, CSA, and FCC Part 15 Class A certifications absent from the SYH6K6RMI data. Both units share identical kVA, wattage, and environmental ratings. The deciding factors are regional outlet standard (IEC vs. NEMA), whether certified hot-swap battery service is a contractual requirement, and whether UL/CSA certification is mandated by the facility's insurance or compliance framework.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | APC by Schneider Electric SYH6K6RMI | APC by Schneider Electric SYH6K6RMT-TF3 |
|---|---|---|
| Output power capacity | 6 kVA | 6 kVA |
| Output power (watts) | 4,200 W | 4,200 W |
| Input connection | Hard Wire 3-wire | Plug-in / 1.83 m cable |
| Input frequency | — | 60 Hz |
| Output receptacles | (8) IEC 320 C13, (2) IEC 320 C19 | (4) NEMA L5-20R, (2) NEMA L6-20R |
| Emergency Power Off (EPO) | Yes | Yes |
| Battery technology | Sealed Lead-Acid, suspended electrolyte | Sealed Lead Acid (VRLA) |
| Hot-swap battery | — | Yes |
| Battery recharge time | — | 3 h |
| Replacement battery | APC SYBT2 | — |
| Runtime at full load | 12.7 min | — |
| Runtime at half load | 30.3 min | — |
| Interface | DB-9 RS-232, RJ-45 (web/SNMP/Telnet) | DB-9 RS-232, RJ-45 |
| Audible alarm | — | Yes |
| Certifications | — | UL 1778, CSA, FCC Part 15 Class A |
| Weight | — | 176.8 kg |
| Colour | Black | Black |
| Operating temperature | 0–40 °C | 0–40 °C |
| Storage temperature | -15–45 °C | -15–45 °C |
| Operating humidity | 0–95% | 0–95% |
| Dimensions (W×D×H mm) | 482.6 × 730.3 × 355.6 | — |
Frequently Asked Questions
Which should you choose: the SYH6K6RMI or the SYH6K6RMT-TF3?
The SYH6K6RMI is the stronger choice when deploying in international or European rack environments that use IEC outlet standards, require hard-wire panel input, and need documented runtime figures — it provides 12.7 min at full load and 30.3 min at half load, and its RJ-45 interface is explicitly confirmed for web/SNMP/Telnet management. The SYH6K6RMT-TF3 is the correct selection for North American facilities running NEMA L5-20R and L6-20R branch circuits; it adds certified hot-swap battery replacement (avoiding downtime during maintenance) and carries UL 1778, CSA, and FCC Part 15 Class A certifications absent from the SYH6K6RMI data. Both units share identical kVA, wattage, and environmental ratings. The deciding factors are regional outlet standard (IEC vs. NEMA), whether certified hot-swap battery service is a contractual requirement, and whether UL/CSA certification is mandated by the facility's insurance or compliance framework.
Is the SYH6K6RMI or SYH6K6RMT-TF3 better for a US-based data center with NEMA twist-lock PDUs?
The SYH6K6RMT-TF3 is the correct fit. It provides four NEMA L5-20R and two NEMA L6-20R output receptacles that match North American twist-lock branch circuits. The SYH6K6RMI outputs IEC 320 C13 and C19 connectors and requires hard-wire 3-wire input, which is incompatible with standard US NEMA plug-in infrastructure without additional rewiring.
Can I replace the battery on either model without taking the UPS offline?
Hot-swap battery replacement is confirmed in the provided specification data only for the SYH6K6RMT-TF3, which explicitly lists hot-swap battery: Yes and a 3-hour recharge time. The SYH6K6RMI specification does not include hot-swap status; buyers with a zero-downtime battery-service requirement should verify this capability directly with APC before selecting the SYH6K6RMI.
Which model gives me confirmed runtime numbers for capacity planning?
Only the SYH6K6RMI provides runtime figures in the available specification data: 12.7 minutes at full load (4,200 W) and 30.3 minutes at half load (2,100 W). The SYH6K6RMT-TF3 specification does not include runtime values. If quantified runtime is required for SLA or generator-start planning, the SYH6K6RMI data supports that calculation; the SYH6K6RMT-TF3 data does not.
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