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STANAG 4133
STANAG 4133 electrical power supplies for generating sets
Manufacturers of military-standard AC and DC generating sets and the defence buyers who specify them.
STANAG 4133 sets NATO's standard types and electrical characteristics for AC and DC rotating generating sets. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 4
- Published
- 2017-03-24
NATO has not released this STANAG publicly. It is NATO UNCLASSIFIED, and organisations that need it obtain it through their national standardization authority.
What it is
STANAG 4133 is NATO's Standardization Agreement on electrical power supplies: standard types and rotating generating sets, AC-DC. Edition 4, promulgated 24 March 2017, sponsored by CNAD's AC/225 NAAG MILENG MatP working group, and covering the publication AEP-4133 edition A. NATO marks it NATO UNCLASSIFIED but has not released it publicly, so this page describes it from a public national implementation, the Czech defence standard ČOS 611501 (4th edition, effective from 8 August 2022), which states that it introduces STANAG 4133 edition 4 and AEP-4133(A) into Czech use. A national implementation can add national requirements and reservations, so treat what follows as the Czech implementation's content, not as NATO's own text. AECTP-250, a public NATO document, lists STANAG 4133 among the power-quality standards that control supply voltage within specified limits for weapon-system platforms and utilisation equipment.
What the Czech implementation requires
ČOS 611501 sets general tactical-technical requirements for AC and DC electrical generating sets driven by combustion engines that produce electrical energy for military armament and equipment; it excludes generating sets for rail vehicles, ships and aircraft, aircraft ground-support equipment, and variable-speed sets. It sets out the standard source types: a 2 DC 28V system, a single-phase 1/N/PE AC 50Hz 230V system, and a three-phase 3/N/PE AC 50Hz 400/230V system, each with a voltage adjustment range, and requires any set rated above 10kW to deliver 400/230V output (208/120V on request), at a rated power factor of 0.8 inductive. Sets are classified by mounting (vehicle-mounted, transportable or portable, the last limited to 50kg per person to carry), by engine (compression-ignition as standard, spark-ignition only on special request), by cooling, by operating mode (standalone or parallel) and by control (manual, semi-automatic or remote).
Rated power (COP) is defined at an ambient temperature of 44°C and 60% relative humidity, and every set must remain operable from -32°C to +44°C, in rain, and in dust concentrations up to 0.5 grams per cubic metre. Ingress protection must be at least IP 2X against contact and foreign bodies and IP X3 against water, rising to IP 44 for domestic-type sockets and IP 67 for industrial sockets. A set must start within 30 seconds at +5°C, within 10 minutes at -15°C, and within 40 minutes at -32°C using auxiliary starting aids. Electromagnetic emissions and susceptibility are tested to MIL-STD-461F, and every set is marked "NATO STANDARD OTAN" and coded by a type-designation scheme built from conductor count, output type, frequency, voltage and power. ČOS 611501's testing chapter runs from a spray-water ingress test through short-circuit protection, a 72-hour continuous run at rated power, fuel-consumption measurement, temperature rise, cold start at -32°C, tilt, vibration and shock, electromagnetic immunity, interference suppression, and a noise measurement limiting sound pressure to 75dB at 7 metres.
Some requirements are explicitly national: the fuels, oils and lubricants used must be types already introduced in the Czech armed forces, and the standard cross-references Czech metrology and technical-inspection procedures and a long list of Czech and European national standards for individual subsystems such as the generator, switchgear and diesel engine. Those tell you how the Czech Republic implements the agreement, not what every NATO nation requires.
How we help
A supplier bound by STANAG 4133 through a contract holds the obtained text through its national authority. In ComplyTrain you record the requirements that apply to you as your own requirements, give each an owner, and keep the evidence that shows you meet them against each one.
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